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-rw-r--r--arch/x86/kernel/Makefile4
-rw-r--r--arch/x86/kernel/acpi/realmode/wakeup.S21
-rw-r--r--arch/x86/kernel/acpi/realmode/wakeup.h5
-rw-r--r--arch/x86/kernel/acpi/realmode/wakeup.lds.S28
-rw-r--r--arch/x86/kernel/acpi/sleep.c65
-rw-r--r--arch/x86/kernel/acpi/sleep.h3
-rw-r--r--arch/x86/kernel/acpi/wakeup_rm.S12
-rw-r--r--arch/x86/kernel/apm_32.c12
-rw-r--r--arch/x86/kernel/entry_32.S2
-rw-r--r--arch/x86/kernel/head32.c9
-rw-r--r--arch/x86/kernel/head_64.S3
-rw-r--r--arch/x86/kernel/reboot.c120
-rw-r--r--arch/x86/kernel/reboot_32.S135
-rw-r--r--arch/x86/kernel/setup.c9
-rw-r--r--arch/x86/kernel/smpboot.c10
-rw-r--r--arch/x86/kernel/trampoline.c42
-rw-r--r--arch/x86/kernel/trampoline_32.S15
-rw-r--r--arch/x86/kernel/trampoline_64.S28
-rw-r--r--arch/x86/kernel/vmlinux.lds.S13
19 files changed, 278 insertions, 258 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 62445ba2f8a8..743642f1a36c 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -47,7 +47,7 @@ obj-y += tsc.o io_delay.o rtc.o
47obj-y += pci-iommu_table.o 47obj-y += pci-iommu_table.o
48obj-y += resource.o 48obj-y += resource.o
49 49
50obj-$(CONFIG_X86_TRAMPOLINE) += trampoline.o 50obj-y += trampoline.o trampoline_$(BITS).o
51obj-y += process.o 51obj-y += process.o
52obj-y += i387.o xsave.o 52obj-y += i387.o xsave.o
53obj-y += ptrace.o 53obj-y += ptrace.o
@@ -59,6 +59,7 @@ obj-$(CONFIG_STACKTRACE) += stacktrace.o
59obj-y += cpu/ 59obj-y += cpu/
60obj-y += acpi/ 60obj-y += acpi/
61obj-y += reboot.o 61obj-y += reboot.o
62obj-$(CONFIG_X86_32) += reboot_32.o
62obj-$(CONFIG_MCA) += mca_32.o 63obj-$(CONFIG_MCA) += mca_32.o
63obj-$(CONFIG_X86_MSR) += msr.o 64obj-$(CONFIG_X86_MSR) += msr.o
64obj-$(CONFIG_X86_CPUID) += cpuid.o 65obj-$(CONFIG_X86_CPUID) += cpuid.o
@@ -69,7 +70,6 @@ obj-$(CONFIG_SMP) += smp.o
69obj-$(CONFIG_SMP) += smpboot.o 70obj-$(CONFIG_SMP) += smpboot.o
70obj-$(CONFIG_SMP) += tsc_sync.o 71obj-$(CONFIG_SMP) += tsc_sync.o
71obj-$(CONFIG_SMP) += setup_percpu.o 72obj-$(CONFIG_SMP) += setup_percpu.o
72obj-$(CONFIG_X86_TRAMPOLINE) += trampoline_$(BITS).o
73obj-$(CONFIG_X86_MPPARSE) += mpparse.o 73obj-$(CONFIG_X86_MPPARSE) += mpparse.o
74obj-y += apic/ 74obj-y += apic/
75obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o 75obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o
diff --git a/arch/x86/kernel/acpi/realmode/wakeup.S b/arch/x86/kernel/acpi/realmode/wakeup.S
index 28595d6df47c..ead21b663117 100644
--- a/arch/x86/kernel/acpi/realmode/wakeup.S
+++ b/arch/x86/kernel/acpi/realmode/wakeup.S
@@ -6,11 +6,17 @@
6#include <asm/page_types.h> 6#include <asm/page_types.h>
7#include <asm/pgtable_types.h> 7#include <asm/pgtable_types.h>
8#include <asm/processor-flags.h> 8#include <asm/processor-flags.h>
9#include "wakeup.h"
9 10
10 .code16 11 .code16
11 .section ".header", "a" 12 .section ".jump", "ax"
13 .globl _start
14_start:
15 cli
16 jmp wakeup_code
12 17
13/* This should match the structure in wakeup.h */ 18/* This should match the structure in wakeup.h */
19 .section ".header", "a"
14 .globl wakeup_header 20 .globl wakeup_header
15wakeup_header: 21wakeup_header:
16video_mode: .short 0 /* Video mode number */ 22video_mode: .short 0 /* Video mode number */
@@ -30,14 +36,11 @@ wakeup_jmp: .byte 0xea /* ljmpw */
30wakeup_jmp_off: .word 3f 36wakeup_jmp_off: .word 3f
31wakeup_jmp_seg: .word 0 37wakeup_jmp_seg: .word 0
32wakeup_gdt: .quad 0, 0, 0 38wakeup_gdt: .quad 0, 0, 0
33signature: .long 0x51ee1111 39signature: .long WAKEUP_HEADER_SIGNATURE
34 40
35 .text 41 .text
36 .globl _start
37 .code16 42 .code16
38wakeup_code: 43wakeup_code:
39_start:
40 cli
41 cld 44 cld
42 45
43 /* Apparently some dimwit BIOS programmers don't know how to 46 /* Apparently some dimwit BIOS programmers don't know how to
@@ -77,12 +80,12 @@ _start:
77 80
78 /* Check header signature... */ 81 /* Check header signature... */
79 movl signature, %eax 82 movl signature, %eax
80 cmpl $0x51ee1111, %eax 83 cmpl $WAKEUP_HEADER_SIGNATURE, %eax
81 jne bogus_real_magic 84 jne bogus_real_magic
82 85
83 /* Check we really have everything... */ 86 /* Check we really have everything... */
84 movl end_signature, %eax 87 movl end_signature, %eax
85 cmpl $0x65a22c82, %eax 88 cmpl $WAKEUP_END_SIGNATURE, %eax
86 jne bogus_real_magic 89 jne bogus_real_magic
87 90
88 /* Call the C code */ 91 /* Call the C code */
@@ -147,3 +150,7 @@ wakeup_heap:
147wakeup_stack: 150wakeup_stack:
148 .space 2048 151 .space 2048
149wakeup_stack_end: 152wakeup_stack_end:
153
154 .section ".signature","a"
155end_signature:
156 .long WAKEUP_END_SIGNATURE
diff --git a/arch/x86/kernel/acpi/realmode/wakeup.h b/arch/x86/kernel/acpi/realmode/wakeup.h
index 69d38d0b2b64..e1828c07e79c 100644
--- a/arch/x86/kernel/acpi/realmode/wakeup.h
+++ b/arch/x86/kernel/acpi/realmode/wakeup.h
@@ -35,7 +35,8 @@ struct wakeup_header {
35extern struct wakeup_header wakeup_header; 35extern struct wakeup_header wakeup_header;
36#endif 36#endif
37 37
38#define HEADER_OFFSET 0x3f00 38#define WAKEUP_HEADER_OFFSET 8
39#define WAKEUP_SIZE 0x4000 39#define WAKEUP_HEADER_SIGNATURE 0x51ee1111
40#define WAKEUP_END_SIGNATURE 0x65a22c82
40 41
41#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */ 42#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */
diff --git a/arch/x86/kernel/acpi/realmode/wakeup.lds.S b/arch/x86/kernel/acpi/realmode/wakeup.lds.S
index 060fff8f5c5b..d4f8010a5b1b 100644
--- a/arch/x86/kernel/acpi/realmode/wakeup.lds.S
+++ b/arch/x86/kernel/acpi/realmode/wakeup.lds.S
@@ -13,9 +13,19 @@ ENTRY(_start)
13SECTIONS 13SECTIONS
14{ 14{
15 . = 0; 15 . = 0;
16 .jump : {
17 *(.jump)
18 } = 0x90909090
19
20 . = WAKEUP_HEADER_OFFSET;
21 .header : {
22 *(.header)
23 }
24
25 . = ALIGN(16);
16 .text : { 26 .text : {
17 *(.text*) 27 *(.text*)
18 } 28 } = 0x90909090
19 29
20 . = ALIGN(16); 30 . = ALIGN(16);
21 .rodata : { 31 .rodata : {
@@ -33,11 +43,6 @@ SECTIONS
33 *(.data*) 43 *(.data*)
34 } 44 }
35 45
36 .signature : {
37 end_signature = .;
38 LONG(0x65a22c82)
39 }
40
41 . = ALIGN(16); 46 . = ALIGN(16);
42 .bss : { 47 .bss : {
43 __bss_start = .; 48 __bss_start = .;
@@ -45,20 +50,13 @@ SECTIONS
45 __bss_end = .; 50 __bss_end = .;
46 } 51 }
47 52
48 . = HEADER_OFFSET; 53 .signature : {
49 .header : { 54 *(.signature)
50 *(.header)
51 } 55 }
52 56
53 . = ALIGN(16);
54 _end = .; 57 _end = .;
55 58
56 /DISCARD/ : { 59 /DISCARD/ : {
57 *(.note*) 60 *(.note*)
58 } 61 }
59
60 /*
61 * The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
62 */
63 . = ASSERT(_end <= WAKEUP_SIZE, "Wakeup too big!");
64} 62}
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 68d1537b8c81..4572c58e66d5 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -18,12 +18,8 @@
18#include "realmode/wakeup.h" 18#include "realmode/wakeup.h"
19#include "sleep.h" 19#include "sleep.h"
20 20
21unsigned long acpi_wakeup_address;
22unsigned long acpi_realmode_flags; 21unsigned long acpi_realmode_flags;
23 22
24/* address in low memory of the wakeup routine. */
25static unsigned long acpi_realmode;
26
27#if defined(CONFIG_SMP) && defined(CONFIG_64BIT) 23#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
28static char temp_stack[4096]; 24static char temp_stack[4096];
29#endif 25#endif
@@ -33,22 +29,17 @@ static char temp_stack[4096];
33 * 29 *
34 * Create an identity mapped page table and copy the wakeup routine to 30 * Create an identity mapped page table and copy the wakeup routine to
35 * low memory. 31 * low memory.
36 *
37 * Note that this is too late to change acpi_wakeup_address.
38 */ 32 */
39int acpi_save_state_mem(void) 33int acpi_save_state_mem(void)
40{ 34{
41 struct wakeup_header *header; 35 struct wakeup_header *header;
36 /* address in low memory of the wakeup routine. */
37 char *acpi_realmode;
42 38
43 if (!acpi_realmode) { 39 acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code);
44 printk(KERN_ERR "Could not allocate memory during boot, "
45 "S3 disabled\n");
46 return -ENOMEM;
47 }
48 memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
49 40
50 header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET); 41 header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET);
51 if (header->signature != 0x51ee1111) { 42 if (header->signature != WAKEUP_HEADER_SIGNATURE) {
52 printk(KERN_ERR "wakeup header does not match\n"); 43 printk(KERN_ERR "wakeup header does not match\n");
53 return -EINVAL; 44 return -EINVAL;
54 } 45 }
@@ -68,9 +59,7 @@ int acpi_save_state_mem(void)
68 /* GDT[0]: GDT self-pointer */ 59 /* GDT[0]: GDT self-pointer */
69 header->wakeup_gdt[0] = 60 header->wakeup_gdt[0] =
70 (u64)(sizeof(header->wakeup_gdt) - 1) + 61 (u64)(sizeof(header->wakeup_gdt) - 1) +
71 ((u64)(acpi_wakeup_address + 62 ((u64)__pa(&header->wakeup_gdt) << 16);
72 ((char *)&header->wakeup_gdt - (char *)acpi_realmode))
73 << 16);
74 /* GDT[1]: big real mode-like code segment */ 63 /* GDT[1]: big real mode-like code segment */
75 header->wakeup_gdt[1] = 64 header->wakeup_gdt[1] =
76 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff); 65 GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
@@ -96,7 +85,7 @@ int acpi_save_state_mem(void)
96 header->pmode_cr3 = (u32)__pa(&initial_page_table); 85 header->pmode_cr3 = (u32)__pa(&initial_page_table);
97 saved_magic = 0x12345678; 86 saved_magic = 0x12345678;
98#else /* CONFIG_64BIT */ 87#else /* CONFIG_64BIT */
99 header->trampoline_segment = setup_trampoline() >> 4; 88 header->trampoline_segment = trampoline_address() >> 4;
100#ifdef CONFIG_SMP 89#ifdef CONFIG_SMP
101 stack_start = (unsigned long)temp_stack + sizeof(temp_stack); 90 stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
102 early_gdt_descr.address = 91 early_gdt_descr.address =
@@ -117,46 +106,6 @@ void acpi_restore_state_mem(void)
117{ 106{
118} 107}
119 108
120
121/**
122 * acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
123 *
124 * We allocate a page from the first 1MB of memory for the wakeup
125 * routine for when we come back from a sleep state. The
126 * runtime allocator allows specification of <16MB pages, but not
127 * <1MB pages.
128 */
129void __init acpi_reserve_wakeup_memory(void)
130{
131 phys_addr_t mem;
132
133 if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
134 printk(KERN_ERR
135 "ACPI: Wakeup code way too big, S3 disabled.\n");
136 return;
137 }
138
139 mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
140
141 if (mem == MEMBLOCK_ERROR) {
142 printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
143 return;
144 }
145 acpi_realmode = (unsigned long) phys_to_virt(mem);
146 acpi_wakeup_address = mem;
147 memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
148}
149
150int __init acpi_configure_wakeup_memory(void)
151{
152 if (acpi_realmode)
153 set_memory_x(acpi_realmode, WAKEUP_SIZE >> PAGE_SHIFT);
154
155 return 0;
156}
157arch_initcall(acpi_configure_wakeup_memory);
158
159
160static int __init acpi_sleep_setup(char *str) 109static int __init acpi_sleep_setup(char *str)
161{ 110{
162 while ((str != NULL) && (*str != '\0')) { 111 while ((str != NULL) && (*str != '\0')) {
diff --git a/arch/x86/kernel/acpi/sleep.h b/arch/x86/kernel/acpi/sleep.h
index adbcbaa6f1df..86ba1c87165b 100644
--- a/arch/x86/kernel/acpi/sleep.h
+++ b/arch/x86/kernel/acpi/sleep.h
@@ -4,13 +4,10 @@
4 4
5#include <asm/trampoline.h> 5#include <asm/trampoline.h>
6 6
7extern char wakeup_code_start, wakeup_code_end;
8
9extern unsigned long saved_video_mode; 7extern unsigned long saved_video_mode;
10extern long saved_magic; 8extern long saved_magic;
11 9
12extern int wakeup_pmode_return; 10extern int wakeup_pmode_return;
13extern char swsusp_pg_dir[PAGE_SIZE];
14 11
15extern unsigned long acpi_copy_wakeup_routine(unsigned long); 12extern unsigned long acpi_copy_wakeup_routine(unsigned long);
16extern void wakeup_long64(void); 13extern void wakeup_long64(void);
diff --git a/arch/x86/kernel/acpi/wakeup_rm.S b/arch/x86/kernel/acpi/wakeup_rm.S
index 6ff3b5730575..63b8ab524f2c 100644
--- a/arch/x86/kernel/acpi/wakeup_rm.S
+++ b/arch/x86/kernel/acpi/wakeup_rm.S
@@ -2,9 +2,11 @@
2 * Wrapper script for the realmode binary as a transport object 2 * Wrapper script for the realmode binary as a transport object
3 * before copying to low memory. 3 * before copying to low memory.
4 */ 4 */
5 .section ".rodata","a" 5#include <asm/page_types.h>
6 .globl wakeup_code_start, wakeup_code_end 6
7wakeup_code_start: 7 .section ".x86_trampoline","a"
8 .balign PAGE_SIZE
9 .globl acpi_wakeup_code
10acpi_wakeup_code:
8 .incbin "arch/x86/kernel/acpi/realmode/wakeup.bin" 11 .incbin "arch/x86/kernel/acpi/realmode/wakeup.bin"
9wakeup_code_end: 12 .size acpi_wakeup_code, .-acpi_wakeup_code
10 .size wakeup_code_start, .-wakeup_code_start
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index 15f47f741983..9079926a5b18 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -976,20 +976,10 @@ recalc:
976 976
977static void apm_power_off(void) 977static void apm_power_off(void)
978{ 978{
979 unsigned char po_bios_call[] = {
980 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
981 0x8e, 0xd0, /* movw ax,ss */
982 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
983 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
984 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
985 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
986 0xcd, 0x15 /* int $0x15 */
987 };
988
989 /* Some bioses don't like being called from CPU != 0 */ 979 /* Some bioses don't like being called from CPU != 0 */
990 if (apm_info.realmode_power_off) { 980 if (apm_info.realmode_power_off) {
991 set_cpus_allowed_ptr(current, cpumask_of(0)); 981 set_cpus_allowed_ptr(current, cpumask_of(0));
992 machine_real_restart(po_bios_call, sizeof(po_bios_call)); 982 machine_real_restart(MRR_APM);
993 } else { 983 } else {
994 (void)set_system_power_state(APM_STATE_OFF); 984 (void)set_system_power_state(APM_STATE_OFF);
995 } 985 }
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index fa41f7298c84..5c1a91974918 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1414,7 +1414,7 @@ ENTRY(async_page_fault)
1414 pushl_cfi $do_async_page_fault 1414 pushl_cfi $do_async_page_fault
1415 jmp error_code 1415 jmp error_code
1416 CFI_ENDPROC 1416 CFI_ENDPROC
1417END(apf_page_fault) 1417END(async_page_fault)
1418#endif 1418#endif
1419 1419
1420/* 1420/*
diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c
index 7f138b3c3c52..d6d6bb361931 100644
--- a/arch/x86/kernel/head32.c
+++ b/arch/x86/kernel/head32.c
@@ -34,15 +34,6 @@ void __init i386_start_kernel(void)
34{ 34{
35 memblock_init(); 35 memblock_init();
36 36
37#ifdef CONFIG_X86_TRAMPOLINE
38 /*
39 * But first pinch a few for the stack/trampoline stuff
40 * FIXME: Don't need the extra page at 4K, but need to fix
41 * trampoline before removing it. (see the GDT stuff)
42 */
43 memblock_x86_reserve_range(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE");
44#endif
45
46 memblock_x86_reserve_range(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); 37 memblock_x86_reserve_range(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
47 38
48#ifdef CONFIG_BLK_DEV_INITRD 39#ifdef CONFIG_BLK_DEV_INITRD
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 239046bd447f..e11e39478a49 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -136,10 +136,9 @@ ident_complete:
136 /* Fixup phys_base */ 136 /* Fixup phys_base */
137 addq %rbp, phys_base(%rip) 137 addq %rbp, phys_base(%rip)
138 138
139#ifdef CONFIG_X86_TRAMPOLINE 139 /* Fixup trampoline */
140 addq %rbp, trampoline_level4_pgt + 0(%rip) 140 addq %rbp, trampoline_level4_pgt + 0(%rip)
141 addq %rbp, trampoline_level4_pgt + (511*8)(%rip) 141 addq %rbp, trampoline_level4_pgt + (511*8)(%rip)
142#endif
143 142
144 /* Due to ENTRY(), sometimes the empty space gets filled with 143 /* Due to ENTRY(), sometimes the empty space gets filled with
145 * zeros. Better take a jmp than relying on empty space being 144 * zeros. Better take a jmp than relying on empty space being
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 715037caeb43..d3ce37edb54d 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -303,68 +303,16 @@ static int __init reboot_init(void)
303} 303}
304core_initcall(reboot_init); 304core_initcall(reboot_init);
305 305
306/* The following code and data reboots the machine by switching to real 306extern const unsigned char machine_real_restart_asm[];
307 mode and jumping to the BIOS reset entry point, as if the CPU has 307extern const u64 machine_real_restart_gdt[3];
308 really been reset. The previous version asked the keyboard
309 controller to pulse the CPU reset line, which is more thorough, but
310 doesn't work with at least one type of 486 motherboard. It is easy
311 to stop this code working; hence the copious comments. */
312static const unsigned long long
313real_mode_gdt_entries [3] =
314{
315 0x0000000000000000ULL, /* Null descriptor */
316 0x00009b000000ffffULL, /* 16-bit real-mode 64k code at 0x00000000 */
317 0x000093000100ffffULL /* 16-bit real-mode 64k data at 0x00000100 */
318};
319 308
320static const struct desc_ptr 309void machine_real_restart(unsigned int type)
321real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries },
322real_mode_idt = { 0x3ff, 0 };
323
324/* This is 16-bit protected mode code to disable paging and the cache,
325 switch to real mode and jump to the BIOS reset code.
326
327 The instruction that switches to real mode by writing to CR0 must be
328 followed immediately by a far jump instruction, which set CS to a
329 valid value for real mode, and flushes the prefetch queue to avoid
330 running instructions that have already been decoded in protected
331 mode.
332
333 Clears all the flags except ET, especially PG (paging), PE
334 (protected-mode enable) and TS (task switch for coprocessor state
335 save). Flushes the TLB after paging has been disabled. Sets CD and
336 NW, to disable the cache on a 486, and invalidates the cache. This
337 is more like the state of a 486 after reset. I don't know if
338 something else should be done for other chips.
339
340 More could be done here to set up the registers as if a CPU reset had
341 occurred; hopefully real BIOSs don't assume much. */
342static const unsigned char real_mode_switch [] =
343{
344 0x66, 0x0f, 0x20, 0xc0, /* movl %cr0,%eax */
345 0x66, 0x83, 0xe0, 0x11, /* andl $0x00000011,%eax */
346 0x66, 0x0d, 0x00, 0x00, 0x00, 0x60, /* orl $0x60000000,%eax */
347 0x66, 0x0f, 0x22, 0xc0, /* movl %eax,%cr0 */
348 0x66, 0x0f, 0x22, 0xd8, /* movl %eax,%cr3 */
349 0x66, 0x0f, 0x20, 0xc3, /* movl %cr0,%ebx */
350 0x66, 0x81, 0xe3, 0x00, 0x00, 0x00, 0x60, /* andl $0x60000000,%ebx */
351 0x74, 0x02, /* jz f */
352 0x0f, 0x09, /* wbinvd */
353 0x24, 0x10, /* f: andb $0x10,al */
354 0x66, 0x0f, 0x22, 0xc0 /* movl %eax,%cr0 */
355};
356static const unsigned char jump_to_bios [] =
357{ 310{
358 0xea, 0x00, 0x00, 0xff, 0xff /* ljmp $0xffff,$0x0000 */ 311 void *restart_va;
359}; 312 unsigned long restart_pa;
313 void (*restart_lowmem)(unsigned int);
314 u64 *lowmem_gdt;
360 315
361/*
362 * Switch to real mode and then execute the code
363 * specified by the code and length parameters.
364 * We assume that length will aways be less that 100!
365 */
366void machine_real_restart(const unsigned char *code, int length)
367{
368 local_irq_disable(); 316 local_irq_disable();
369 317
370 /* Write zero to CMOS register number 0x0f, which the BIOS POST 318 /* Write zero to CMOS register number 0x0f, which the BIOS POST
@@ -392,41 +340,23 @@ void machine_real_restart(const unsigned char *code, int length)
392 too. */ 340 too. */
393 *((unsigned short *)0x472) = reboot_mode; 341 *((unsigned short *)0x472) = reboot_mode;
394 342
395 /* For the switch to real mode, copy some code to low memory. It has 343 /* Patch the GDT in the low memory trampoline */
396 to be in the first 64k because it is running in 16-bit mode, and it 344 lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt);
397 has to have the same physical and virtual address, because it turns 345
398 off paging. Copy it near the end of the first page, out of the way 346 restart_va = TRAMPOLINE_SYM(machine_real_restart_asm);
399 of BIOS variables. */ 347 restart_pa = virt_to_phys(restart_va);
400 memcpy((void *)(0x1000 - sizeof(real_mode_switch) - 100), 348 restart_lowmem = (void (*)(unsigned int))restart_pa;
401 real_mode_switch, sizeof (real_mode_switch)); 349
402 memcpy((void *)(0x1000 - 100), code, length); 350 /* GDT[0]: GDT self-pointer */
403 351 lowmem_gdt[0] =
404 /* Set up the IDT for real mode. */ 352 (u64)(sizeof(machine_real_restart_gdt) - 1) +
405 load_idt(&real_mode_idt); 353 ((u64)virt_to_phys(lowmem_gdt) << 16);
406 354 /* GDT[1]: 64K real mode code segment */
407 /* Set up a GDT from which we can load segment descriptors for real 355 lowmem_gdt[1] =
408 mode. The GDT is not used in real mode; it is just needed here to 356 GDT_ENTRY(0x009b, restart_pa, 0xffff);
409 prepare the descriptors. */ 357
410 load_gdt(&real_mode_gdt); 358 /* Jump to the identity-mapped low memory code */
411 359 restart_lowmem(type);
412 /* Load the data segment registers, and thus the descriptors ready for
413 real mode. The base address of each segment is 0x100, 16 times the
414 selector value being loaded here. This is so that the segment
415 registers don't have to be reloaded after switching to real mode:
416 the values are consistent for real mode operation already. */
417 __asm__ __volatile__ ("movl $0x0010,%%eax\n"
418 "\tmovl %%eax,%%ds\n"
419 "\tmovl %%eax,%%es\n"
420 "\tmovl %%eax,%%fs\n"
421 "\tmovl %%eax,%%gs\n"
422 "\tmovl %%eax,%%ss" : : : "eax");
423
424 /* Jump to the 16-bit code that we copied earlier. It disables paging
425 and the cache, switches to real mode, and jumps to the BIOS reset
426 entry point. */
427 __asm__ __volatile__ ("ljmp $0x0008,%0"
428 :
429 : "i" ((void *)(0x1000 - sizeof (real_mode_switch) - 100)));
430} 360}
431#ifdef CONFIG_APM_MODULE 361#ifdef CONFIG_APM_MODULE
432EXPORT_SYMBOL(machine_real_restart); 362EXPORT_SYMBOL(machine_real_restart);
@@ -581,7 +511,7 @@ static void native_machine_emergency_restart(void)
581 511
582#ifdef CONFIG_X86_32 512#ifdef CONFIG_X86_32
583 case BOOT_BIOS: 513 case BOOT_BIOS:
584 machine_real_restart(jump_to_bios, sizeof(jump_to_bios)); 514 machine_real_restart(MRR_BIOS);
585 515
586 reboot_type = BOOT_KBD; 516 reboot_type = BOOT_KBD;
587 break; 517 break;
diff --git a/arch/x86/kernel/reboot_32.S b/arch/x86/kernel/reboot_32.S
new file mode 100644
index 000000000000..29092b38d816
--- /dev/null
+++ b/arch/x86/kernel/reboot_32.S
@@ -0,0 +1,135 @@
1#include <linux/linkage.h>
2#include <linux/init.h>
3#include <asm/segment.h>
4#include <asm/page_types.h>
5
6/*
7 * The following code and data reboots the machine by switching to real
8 * mode and jumping to the BIOS reset entry point, as if the CPU has
9 * really been reset. The previous version asked the keyboard
10 * controller to pulse the CPU reset line, which is more thorough, but
11 * doesn't work with at least one type of 486 motherboard. It is easy
12 * to stop this code working; hence the copious comments.
13 *
14 * This code is called with the restart type (0 = BIOS, 1 = APM) in %eax.
15 */
16 .section ".x86_trampoline","a"
17 .balign 16
18 .code32
19ENTRY(machine_real_restart_asm)
20r_base = .
21 /* Get our own relocated address */
22 call 1f
231: popl %ebx
24 subl $1b, %ebx
25
26 /* Compute the equivalent real-mode segment */
27 movl %ebx, %ecx
28 shrl $4, %ecx
29
30 /* Patch post-real-mode segment jump */
31 movw dispatch_table(%ebx,%eax,2),%ax
32 movw %ax, 101f(%ebx)
33 movw %cx, 102f(%ebx)
34
35 /* Set up the IDT for real mode. */
36 lidtl machine_real_restart_idt(%ebx)
37
38 /*
39 * Set up a GDT from which we can load segment descriptors for real
40 * mode. The GDT is not used in real mode; it is just needed here to
41 * prepare the descriptors.
42 */
43 lgdtl machine_real_restart_gdt(%ebx)
44
45 /*
46 * Load the data segment registers with 16-bit compatible values
47 */
48 movl $16, %ecx
49 movl %ecx, %ds
50 movl %ecx, %es
51 movl %ecx, %fs
52 movl %ecx, %gs
53 movl %ecx, %ss
54 ljmpl $8, $1f - r_base
55
56/*
57 * This is 16-bit protected mode code to disable paging and the cache,
58 * switch to real mode and jump to the BIOS reset code.
59 *
60 * The instruction that switches to real mode by writing to CR0 must be
61 * followed immediately by a far jump instruction, which set CS to a
62 * valid value for real mode, and flushes the prefetch queue to avoid
63 * running instructions that have already been decoded in protected
64 * mode.
65 *
66 * Clears all the flags except ET, especially PG (paging), PE
67 * (protected-mode enable) and TS (task switch for coprocessor state
68 * save). Flushes the TLB after paging has been disabled. Sets CD and
69 * NW, to disable the cache on a 486, and invalidates the cache. This
70 * is more like the state of a 486 after reset. I don't know if
71 * something else should be done for other chips.
72 *
73 * More could be done here to set up the registers as if a CPU reset had
74 * occurred; hopefully real BIOSs don't assume much. This is not the
75 * actual BIOS entry point, anyway (that is at 0xfffffff0).
76 *
77 * Most of this work is probably excessive, but it is what is tested.
78 */
79 .code16
801:
81 xorl %ecx, %ecx
82 movl %cr0, %eax
83 andl $0x00000011, %eax
84 orl $0x60000000, %eax
85 movl %eax, %cr0
86 movl %ecx, %cr3
87 movl %cr0, %edx
88 andl $0x60000000, %edx /* If no cache bits -> no wbinvd */
89 jz 2f
90 wbinvd
912:
92 andb $0x10, %al
93 movl %eax, %cr0
94 .byte 0xea /* ljmpw */
95101: .word 0 /* Offset */
96102: .word 0 /* Segment */
97
98bios:
99 ljmpw $0xf000, $0xfff0
100
101apm:
102 movw $0x1000, %ax
103 movw %ax, %ss
104 movw $0xf000, %sp
105 movw $0x5307, %ax
106 movw $0x0001, %bx
107 movw $0x0003, %cx
108 int $0x15
109
110END(machine_real_restart_asm)
111
112 .balign 16
113 /* These must match <asm/reboot.h */
114dispatch_table:
115 .word bios - r_base
116 .word apm - r_base
117END(dispatch_table)
118
119 .balign 16
120machine_real_restart_idt:
121 .word 0xffff /* Length - real mode default value */
122 .long 0 /* Base - real mode default value */
123END(machine_real_restart_idt)
124
125 .balign 16
126ENTRY(machine_real_restart_gdt)
127 .quad 0 /* Self-pointer, filled in by PM code */
128 .quad 0 /* 16-bit code segment, filled in by PM code */
129 /*
130 * 16-bit data segment with the selector value 16 = 0x10 and
131 * base value 0x100; since this is consistent with real mode
132 * semantics we don't have to reload the segments once CR0.PE = 0.
133 */
134 .quad GDT_ENTRY(0x0093, 0x100, 0xffff)
135END(machine_real_restart_gdt)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b176f2b1f45d..9d43b28e0728 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -963,15 +963,8 @@ void __init setup_arch(char **cmdline_p)
963 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n", 963 printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
964 max_pfn_mapped<<PAGE_SHIFT); 964 max_pfn_mapped<<PAGE_SHIFT);
965 965
966 reserve_trampoline_memory(); 966 setup_trampolines();
967 967
968#ifdef CONFIG_ACPI_SLEEP
969 /*
970 * Reserve low memory region for sleep support.
971 * even before init_memory_mapping
972 */
973 acpi_reserve_wakeup_memory();
974#endif
975 init_gbpages(); 968 init_gbpages();
976 969
977 /* max_pfn_mapped is updated here */ 970 /* max_pfn_mapped is updated here */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index e9efdfd51c8d..c2871d3c71b6 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -711,7 +711,7 @@ do_rest:
711 stack_start = c_idle.idle->thread.sp; 711 stack_start = c_idle.idle->thread.sp;
712 712
713 /* start_ip had better be page-aligned! */ 713 /* start_ip had better be page-aligned! */
714 start_ip = setup_trampoline(); 714 start_ip = trampoline_address();
715 715
716 /* So we see what's up */ 716 /* So we see what's up */
717 announce_cpu(cpu, apicid); 717 announce_cpu(cpu, apicid);
@@ -721,6 +721,8 @@ do_rest:
721 * the targeted processor. 721 * the targeted processor.
722 */ 722 */
723 723
724 printk(KERN_DEBUG "smpboot cpu %d: start_ip = %lx\n", cpu, start_ip);
725
724 atomic_set(&init_deasserted, 0); 726 atomic_set(&init_deasserted, 0);
725 727
726 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { 728 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
@@ -774,8 +776,8 @@ do_rest:
774 pr_debug("CPU%d: has booted.\n", cpu); 776 pr_debug("CPU%d: has booted.\n", cpu);
775 else { 777 else {
776 boot_error = 1; 778 boot_error = 1;
777 if (*((volatile unsigned char *)trampoline_base) 779 if (*(volatile u32 *)TRAMPOLINE_SYM(trampoline_status)
778 == 0xA5) 780 == 0xA5A5A5A5)
779 /* trampoline started but...? */ 781 /* trampoline started but...? */
780 pr_err("CPU%d: Stuck ??\n", cpu); 782 pr_err("CPU%d: Stuck ??\n", cpu);
781 else 783 else
@@ -801,7 +803,7 @@ do_rest:
801 } 803 }
802 804
803 /* mark "stuck" area as not stuck */ 805 /* mark "stuck" area as not stuck */
804 *((volatile unsigned long *)trampoline_base) = 0; 806 *(volatile u32 *)TRAMPOLINE_SYM(trampoline_status) = 0;
805 807
806 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { 808 if (get_uv_system_type() != UV_NON_UNIQUE_APIC) {
807 /* 809 /*
diff --git a/arch/x86/kernel/trampoline.c b/arch/x86/kernel/trampoline.c
index a375616d77f7..a91ae7709b49 100644
--- a/arch/x86/kernel/trampoline.c
+++ b/arch/x86/kernel/trampoline.c
@@ -2,39 +2,41 @@
2#include <linux/memblock.h> 2#include <linux/memblock.h>
3 3
4#include <asm/trampoline.h> 4#include <asm/trampoline.h>
5#include <asm/cacheflush.h>
5#include <asm/pgtable.h> 6#include <asm/pgtable.h>
6 7
7#if defined(CONFIG_X86_64) && defined(CONFIG_ACPI_SLEEP) 8unsigned char *x86_trampoline_base;
8#define __trampinit
9#define __trampinitdata
10#else
11#define __trampinit __cpuinit
12#define __trampinitdata __cpuinitdata
13#endif
14 9
15/* ready for x86_64 and x86 */ 10void __init setup_trampolines(void)
16unsigned char *__trampinitdata trampoline_base;
17
18void __init reserve_trampoline_memory(void)
19{ 11{
20 phys_addr_t mem; 12 phys_addr_t mem;
13 size_t size = PAGE_ALIGN(x86_trampoline_end - x86_trampoline_start);
21 14
22 /* Has to be in very low memory so we can execute real-mode AP code. */ 15 /* Has to be in very low memory so we can execute real-mode AP code. */
23 mem = memblock_find_in_range(0, 1<<20, TRAMPOLINE_SIZE, PAGE_SIZE); 16 mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE);
24 if (mem == MEMBLOCK_ERROR) 17 if (mem == MEMBLOCK_ERROR)
25 panic("Cannot allocate trampoline\n"); 18 panic("Cannot allocate trampoline\n");
26 19
27 trampoline_base = __va(mem); 20 x86_trampoline_base = __va(mem);
28 memblock_x86_reserve_range(mem, mem + TRAMPOLINE_SIZE, "TRAMPOLINE"); 21 memblock_x86_reserve_range(mem, mem + size, "TRAMPOLINE");
22
23 printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
24 x86_trampoline_base, (unsigned long long)mem, size);
25
26 memcpy(x86_trampoline_base, x86_trampoline_start, size);
29} 27}
30 28
31/* 29/*
32 * Currently trivial. Write the real->protected mode 30 * setup_trampolines() gets called very early, to guarantee the
33 * bootstrap into the page concerned. The caller 31 * availability of low memory. This is before the proper kernel page
34 * has made sure it's suitably aligned. 32 * tables are set up, so we cannot set page permissions in that
33 * function. Thus, we use an arch_initcall instead.
35 */ 34 */
36unsigned long __trampinit setup_trampoline(void) 35static int __init configure_trampolines(void)
37{ 36{
38 memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE); 37 size_t size = PAGE_ALIGN(x86_trampoline_end - x86_trampoline_start);
39 return virt_to_phys(trampoline_base); 38
39 set_memory_x((unsigned long)x86_trampoline_base, size >> PAGE_SHIFT);
40 return 0;
40} 41}
42arch_initcall(configure_trampolines);
diff --git a/arch/x86/kernel/trampoline_32.S b/arch/x86/kernel/trampoline_32.S
index 8508237e8e43..451c0a7ef7fd 100644
--- a/arch/x86/kernel/trampoline_32.S
+++ b/arch/x86/kernel/trampoline_32.S
@@ -32,9 +32,11 @@
32#include <asm/segment.h> 32#include <asm/segment.h>
33#include <asm/page_types.h> 33#include <asm/page_types.h>
34 34
35/* We can free up trampoline after bootup if cpu hotplug is not supported. */ 35#ifdef CONFIG_SMP
36__CPUINITRODATA 36
37.code16 37 .section ".x86_trampoline","a"
38 .balign PAGE_SIZE
39 .code16
38 40
39ENTRY(trampoline_data) 41ENTRY(trampoline_data)
40r_base = . 42r_base = .
@@ -44,7 +46,7 @@ r_base = .
44 46
45 cli # We should be safe anyway 47 cli # We should be safe anyway
46 48
47 movl $0xA5A5A5A5, trampoline_data - r_base 49 movl $0xA5A5A5A5, trampoline_status - r_base
48 # write marker for master knows we're running 50 # write marker for master knows we're running
49 51
50 /* GDT tables in non default location kernel can be beyond 16MB and 52 /* GDT tables in non default location kernel can be beyond 16MB and
@@ -72,5 +74,10 @@ boot_idt_descr:
72 .word 0 # idt limit = 0 74 .word 0 # idt limit = 0
73 .long 0 # idt base = 0L 75 .long 0 # idt base = 0L
74 76
77ENTRY(trampoline_status)
78 .long 0
79
75.globl trampoline_end 80.globl trampoline_end
76trampoline_end: 81trampoline_end:
82
83#endif /* CONFIG_SMP */
diff --git a/arch/x86/kernel/trampoline_64.S b/arch/x86/kernel/trampoline_64.S
index 075d130efcf9..09ff51799e96 100644
--- a/arch/x86/kernel/trampoline_64.S
+++ b/arch/x86/kernel/trampoline_64.S
@@ -32,13 +32,9 @@
32#include <asm/segment.h> 32#include <asm/segment.h>
33#include <asm/processor-flags.h> 33#include <asm/processor-flags.h>
34 34
35#ifdef CONFIG_ACPI_SLEEP 35 .section ".x86_trampoline","a"
36.section .rodata, "a", @progbits 36 .balign PAGE_SIZE
37#else 37 .code16
38/* We can free up the trampoline after bootup if cpu hotplug is not supported. */
39__CPUINITRODATA
40#endif
41.code16
42 38
43ENTRY(trampoline_data) 39ENTRY(trampoline_data)
44r_base = . 40r_base = .
@@ -50,7 +46,7 @@ r_base = .
50 mov %ax, %ss 46 mov %ax, %ss
51 47
52 48
53 movl $0xA5A5A5A5, trampoline_data - r_base 49 movl $0xA5A5A5A5, trampoline_status - r_base
54 # write marker for master knows we're running 50 # write marker for master knows we're running
55 51
56 # Setup stack 52 # Setup stack
@@ -64,10 +60,13 @@ r_base = .
64 movzx %ax, %esi # Find the 32bit trampoline location 60 movzx %ax, %esi # Find the 32bit trampoline location
65 shll $4, %esi 61 shll $4, %esi
66 62
67 # Fixup the vectors 63 # Fixup the absolute vectors
68 addl %esi, startup_32_vector - r_base 64 leal (startup_32 - r_base)(%esi), %eax
69 addl %esi, startup_64_vector - r_base 65 movl %eax, startup_32_vector - r_base
70 addl %esi, tgdt + 2 - r_base # Fixup the gdt pointer 66 leal (startup_64 - r_base)(%esi), %eax
67 movl %eax, startup_64_vector - r_base
68 leal (tgdt - r_base)(%esi), %eax
69 movl %eax, (tgdt + 2 - r_base)
71 70
72 /* 71 /*
73 * GDT tables in non default location kernel can be beyond 16MB and 72 * GDT tables in non default location kernel can be beyond 16MB and
@@ -129,6 +128,7 @@ no_longmode:
129 jmp no_longmode 128 jmp no_longmode
130#include "verify_cpu.S" 129#include "verify_cpu.S"
131 130
131 .balign 4
132 # Careful these need to be in the same 64K segment as the above; 132 # Careful these need to be in the same 64K segment as the above;
133tidt: 133tidt:
134 .word 0 # idt limit = 0 134 .word 0 # idt limit = 0
@@ -156,6 +156,10 @@ startup_64_vector:
156 .long startup_64 - r_base 156 .long startup_64 - r_base
157 .word __KERNEL_CS, 0 157 .word __KERNEL_CS, 0
158 158
159 .balign 4
160ENTRY(trampoline_status)
161 .long 0
162
159trampoline_stack: 163trampoline_stack:
160 .org 0x1000 164 .org 0x1000
161trampoline_stack_end: 165trampoline_stack_end:
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 101c32309f17..624a2016198e 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -241,6 +241,18 @@ SECTIONS
241 241
242 INIT_DATA_SECTION(16) 242 INIT_DATA_SECTION(16)
243 243
244 /*
245 * Code and data for a variety of lowlevel trampolines, to be
246 * copied into base memory (< 1 MiB) during initialization.
247 * Since it is copied early, the main copy can be discarded
248 * afterwards.
249 */
250 .x86_trampoline : AT(ADDR(.x86_trampoline) - LOAD_OFFSET) {
251 x86_trampoline_start = .;
252 *(.x86_trampoline)
253 x86_trampoline_end = .;
254 }
255
244 .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) { 256 .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
245 __x86_cpu_dev_start = .; 257 __x86_cpu_dev_start = .;
246 *(.x86_cpu_dev.init) 258 *(.x86_cpu_dev.init)
@@ -292,6 +304,7 @@ SECTIONS
292 *(.iommu_table) 304 *(.iommu_table)
293 __iommu_table_end = .; 305 __iommu_table_end = .;
294 } 306 }
307
295 . = ALIGN(8); 308 . = ALIGN(8);
296 /* 309 /*
297 * .exit.text is discard at runtime, not link time, to deal with 310 * .exit.text is discard at runtime, not link time, to deal with
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-06 11:38:17 -0500