diff options
Diffstat (limited to 'arch/x86/kernel/trampoline_32.S')
| -rw-r--r-- | arch/x86/kernel/trampoline_32.S | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/arch/x86/kernel/trampoline_32.S b/arch/x86/kernel/trampoline_32.S deleted file mode 100644 index 451c0a7ef7f..00000000000 --- a/arch/x86/kernel/trampoline_32.S +++ /dev/null | |||
| @@ -1,83 +0,0 @@ | |||
| 1 | /* | ||
| 2 | * | ||
| 3 | * Trampoline.S Derived from Setup.S by Linus Torvalds | ||
| 4 | * | ||
| 5 | * 4 Jan 1997 Michael Chastain: changed to gnu as. | ||
| 6 | * | ||
| 7 | * This is only used for booting secondary CPUs in SMP machine | ||
| 8 | * | ||
| 9 | * Entry: CS:IP point to the start of our code, we are | ||
| 10 | * in real mode with no stack, but the rest of the | ||
| 11 | * trampoline page to make our stack and everything else | ||
| 12 | * is a mystery. | ||
| 13 | * | ||
| 14 | * We jump into arch/x86/kernel/head_32.S. | ||
| 15 | * | ||
| 16 | * On entry to trampoline_data, the processor is in real mode | ||
| 17 | * with 16-bit addressing and 16-bit data. CS has some value | ||
| 18 | * and IP is zero. Thus, data addresses need to be absolute | ||
| 19 | * (no relocation) and are taken with regard to r_base. | ||
| 20 | * | ||
| 21 | * If you work on this file, check the object module with | ||
| 22 | * objdump --reloc to make sure there are no relocation | ||
| 23 | * entries except for: | ||
| 24 | * | ||
| 25 | * TYPE VALUE | ||
| 26 | * R_386_32 startup_32_smp | ||
| 27 | * R_386_32 boot_gdt | ||
| 28 | */ | ||
| 29 | |||
| 30 | #include <linux/linkage.h> | ||
| 31 | #include <linux/init.h> | ||
| 32 | #include <asm/segment.h> | ||
| 33 | #include <asm/page_types.h> | ||
| 34 | |||
| 35 | #ifdef CONFIG_SMP | ||
| 36 | |||
| 37 | .section ".x86_trampoline","a" | ||
| 38 | .balign PAGE_SIZE | ||
| 39 | .code16 | ||
| 40 | |||
| 41 | ENTRY(trampoline_data) | ||
| 42 | r_base = . | ||
| 43 | wbinvd # Needed for NUMA-Q should be harmless for others | ||
| 44 | mov %cs, %ax # Code and data in the same place | ||
| 45 | mov %ax, %ds | ||
| 46 | |||
| 47 | cli # We should be safe anyway | ||
| 48 | |||
| 49 | movl $0xA5A5A5A5, trampoline_status - r_base | ||
| 50 | # write marker for master knows we're running | ||
| 51 | |||
| 52 | /* GDT tables in non default location kernel can be beyond 16MB and | ||
| 53 | * lgdt will not be able to load the address as in real mode default | ||
| 54 | * operand size is 16bit. Use lgdtl instead to force operand size | ||
| 55 | * to 32 bit. | ||
| 56 | */ | ||
| 57 | |||
| 58 | lidtl boot_idt_descr - r_base # load idt with 0, 0 | ||
| 59 | lgdtl boot_gdt_descr - r_base # load gdt with whatever is appropriate | ||
| 60 | |||
| 61 | xor %ax, %ax | ||
| 62 | inc %ax # protected mode (PE) bit | ||
| 63 | lmsw %ax # into protected mode | ||
| 64 | # flush prefetch and jump to startup_32_smp in arch/i386/kernel/head.S | ||
| 65 | ljmpl $__BOOT_CS, $(startup_32_smp-__PAGE_OFFSET) | ||
| 66 | |||
| 67 | # These need to be in the same 64K segment as the above; | ||
| 68 | # hence we don't use the boot_gdt_descr defined in head.S | ||
| 69 | boot_gdt_descr: | ||
| 70 | .word __BOOT_DS + 7 # gdt limit | ||
| 71 | .long boot_gdt - __PAGE_OFFSET # gdt base | ||
| 72 | |||
| 73 | boot_idt_descr: | ||
| 74 | .word 0 # idt limit = 0 | ||
| 75 | .long 0 # idt base = 0L | ||
| 76 | |||
| 77 | ENTRY(trampoline_status) | ||
| 78 | .long 0 | ||
| 79 | |||
| 80 | .globl trampoline_end | ||
| 81 | trampoline_end: | ||
| 82 | |||
| 83 | #endif /* CONFIG_SMP */ | ||