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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-10-18 17:34:47 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-10-18 17:34:47 -0400
commita0a55682b83fd5f012afadcf415b030d7424ae68 (patch)
tree97ad3cb7e3443f09fbe55f57d3c36994b20a8e52 /arch/arm/kernel
parent23beab76b490172a9ff3d52843e4d27a35b2a4c6 (diff)
parent865a4fae7793b80e2b8bca76e279d6dfecbeac17 (diff)
Merge branch 'hotplug' into devel
Conflicts: arch/arm/kernel/head-common.S
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/head-common.S305
-rw-r--r--arch/arm/kernel/head-nommu.S5
-rw-r--r--arch/arm/kernel/head.S250
-rw-r--r--arch/arm/kernel/smp.c63
-rw-r--r--arch/arm/kernel/vmlinux.lds.S24
5 files changed, 371 insertions, 276 deletions
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 58a3e632b6d..bbecaac1e01 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -15,55 +15,6 @@
15#define ATAG_CORE_SIZE ((2*4 + 3*4) >> 2) 15#define ATAG_CORE_SIZE ((2*4 + 3*4) >> 2)
16#define ATAG_CORE_SIZE_EMPTY ((2*4) >> 2) 16#define ATAG_CORE_SIZE_EMPTY ((2*4) >> 2)
17 17
18 .align 2
19 .type __switch_data, %object
20__switch_data:
21 .long __mmap_switched
22 .long __data_loc @ r4
23 .long _sdata @ r5
24 .long __bss_start @ r6
25 .long _end @ r7
26 .long processor_id @ r4
27 .long __machine_arch_type @ r5
28 .long __atags_pointer @ r6
29 .long cr_alignment @ r7
30 .long init_thread_union + THREAD_START_SP @ sp
31
32/*
33 * The following fragment of code is executed with the MMU on in MMU mode,
34 * and uses absolute addresses; this is not position independent.
35 *
36 * r0 = cp#15 control register
37 * r1 = machine ID
38 * r2 = atags pointer
39 * r9 = processor ID
40 */
41__mmap_switched:
42 adr r3, __switch_data + 4
43
44 ldmia r3!, {r4, r5, r6, r7}
45 cmp r4, r5 @ Copy data segment if needed
461: cmpne r5, r6
47 ldrne fp, [r4], #4
48 strne fp, [r5], #4
49 bne 1b
50
51 mov fp, #0 @ Clear BSS (and zero fp)
521: cmp r6, r7
53 strcc fp, [r6],#4
54 bcc 1b
55
56 ARM( ldmia r3, {r4, r5, r6, r7, sp})
57 THUMB( ldmia r3, {r4, r5, r6, r7} )
58 THUMB( ldr sp, [r3, #16] )
59 str r9, [r4] @ Save processor ID
60 str r1, [r5] @ Save machine type
61 str r2, [r6] @ Save atags pointer
62 bic r4, r0, #CR_A @ Clear 'A' bit
63 stmia r7, {r0, r4} @ Save control register values
64 b start_kernel
65ENDPROC(__mmap_switched)
66
67/* 18/*
68 * Exception handling. Something went wrong and we can't proceed. We 19 * Exception handling. Something went wrong and we can't proceed. We
69 * ought to tell the user, but since we don't have any guarantee that 20 * ought to tell the user, but since we don't have any guarantee that
@@ -73,21 +24,7 @@ ENDPROC(__mmap_switched)
73 * and hope for the best (useful if bootloader fails to pass a proper 24 * and hope for the best (useful if bootloader fails to pass a proper
74 * machine ID for example). 25 * machine ID for example).
75 */ 26 */
76__error_p: 27 __HEAD
77#ifdef CONFIG_DEBUG_LL
78 adr r0, str_p1
79 bl printascii
80 mov r0, r9
81 bl printhex8
82 adr r0, str_p2
83 bl printascii
84 b __error
85str_p1: .asciz "\nError: unrecognized/unsupported processor variant (0x"
86str_p2: .asciz ").\n"
87 .align
88#endif
89ENDPROC(__error_p)
90
91__error_a: 28__error_a:
92#ifdef CONFIG_DEBUG_LL 29#ifdef CONFIG_DEBUG_LL
93 mov r4, r1 @ preserve machine ID 30 mov r4, r1 @ preserve machine ID
@@ -97,7 +34,7 @@ __error_a:
97 bl printhex8 34 bl printhex8
98 adr r0, str_a2 35 adr r0, str_a2
99 bl printascii 36 bl printascii
100 adr r3, 4f 37 adr r3, __lookup_machine_type_data
101 ldmia r3, {r4, r5, r6} @ get machine desc list 38 ldmia r3, {r4, r5, r6} @ get machine desc list
102 sub r4, r3, r4 @ get offset between virt&phys 39 sub r4, r3, r4 @ get offset between virt&phys
103 add r5, r5, r4 @ convert virt addresses to 40 add r5, r5, r4 @ convert virt addresses to
@@ -125,78 +62,6 @@ str_a3: .asciz "\nPlease check your kernel config and/or bootloader.\n"
125 .align 62 .align
126#endif 63#endif
127 64
128__error:
129#ifdef CONFIG_ARCH_RPC
130/*
131 * Turn the screen red on a error - RiscPC only.
132 */
133 mov r0, #0x02000000
134 mov r3, #0x11
135 orr r3, r3, r3, lsl #8
136 orr r3, r3, r3, lsl #16
137 str r3, [r0], #4
138 str r3, [r0], #4
139 str r3, [r0], #4
140 str r3, [r0], #4
141#endif
1421: mov r0, r0
143 b 1b
144ENDPROC(__error)
145
146
147/*
148 * Read processor ID register (CP#15, CR0), and look up in the linker-built
149 * supported processor list. Note that we can't use the absolute addresses
150 * for the __proc_info lists since we aren't running with the MMU on
151 * (and therefore, we are not in the correct address space). We have to
152 * calculate the offset.
153 *
154 * r9 = cpuid
155 * Returns:
156 * r3, r4, r6 corrupted
157 * r5 = proc_info pointer in physical address space
158 * r9 = cpuid (preserved)
159 */
160__lookup_processor_type:
161 adr r3, 3f
162 ldmia r3, {r5 - r7}
163 add r3, r3, #8
164 sub r3, r3, r7 @ get offset between virt&phys
165 add r5, r5, r3 @ convert virt addresses to
166 add r6, r6, r3 @ physical address space
1671: ldmia r5, {r3, r4} @ value, mask
168 and r4, r4, r9 @ mask wanted bits
169 teq r3, r4
170 beq 2f
171 add r5, r5, #PROC_INFO_SZ @ sizeof(proc_info_list)
172 cmp r5, r6
173 blo 1b
174 mov r5, #0 @ unknown processor
1752: mov pc, lr
176ENDPROC(__lookup_processor_type)
177
178/*
179 * This provides a C-API version of the above function.
180 */
181ENTRY(lookup_processor_type)
182 stmfd sp!, {r4 - r7, r9, lr}
183 mov r9, r0
184 bl __lookup_processor_type
185 mov r0, r5
186 ldmfd sp!, {r4 - r7, r9, pc}
187ENDPROC(lookup_processor_type)
188
189/*
190 * Look in <asm/procinfo.h> and arch/arm/kernel/arch.[ch] for
191 * more information about the __proc_info and __arch_info structures.
192 */
193 .align 2
1943: .long __proc_info_begin
195 .long __proc_info_end
1964: .long .
197 .long __arch_info_begin
198 .long __arch_info_end
199
200/* 65/*
201 * Lookup machine architecture in the linker-build list of architectures. 66 * Lookup machine architecture in the linker-build list of architectures.
202 * Note that we can't use the absolute addresses for the __arch_info 67 * Note that we can't use the absolute addresses for the __arch_info
@@ -209,7 +74,7 @@ ENDPROC(lookup_processor_type)
209 * r5 = mach_info pointer in physical address space 74 * r5 = mach_info pointer in physical address space
210 */ 75 */
211__lookup_machine_type: 76__lookup_machine_type:
212 adr r3, 4b 77 adr r3, __lookup_machine_type_data
213 ldmia r3, {r4, r5, r6} 78 ldmia r3, {r4, r5, r6}
214 sub r3, r3, r4 @ get offset between virt&phys 79 sub r3, r3, r4 @ get offset between virt&phys
215 add r5, r5, r3 @ convert virt addresses to 80 add r5, r5, r3 @ convert virt addresses to
@@ -225,15 +90,16 @@ __lookup_machine_type:
225ENDPROC(__lookup_machine_type) 90ENDPROC(__lookup_machine_type)
226 91
227/* 92/*
228 * This provides a C-API version of the above function. 93 * Look in arch/arm/kernel/arch.[ch] for information about the
94 * __arch_info structures.
229 */ 95 */
230ENTRY(lookup_machine_type) 96 .align 2
231 stmfd sp!, {r4 - r6, lr} 97 .type __lookup_machine_type_data, %object
232 mov r1, r0 98__lookup_machine_type_data:
233 bl __lookup_machine_type 99 .long .
234 mov r0, r5 100 .long __arch_info_begin
235 ldmfd sp!, {r4 - r6, pc} 101 .long __arch_info_end
236ENDPROC(lookup_machine_type) 102 .size __lookup_machine_type_data, . - __lookup_machine_type_data
237 103
238/* Determine validity of the r2 atags pointer. The heuristic requires 104/* Determine validity of the r2 atags pointer. The heuristic requires
239 * that the pointer be aligned, in the first 16k of physical RAM and 105 * that the pointer be aligned, in the first 16k of physical RAM and
@@ -265,3 +131,150 @@ __vet_atags:
2651: mov r2, #0 1311: mov r2, #0
266 mov pc, lr 132 mov pc, lr
267ENDPROC(__vet_atags) 133ENDPROC(__vet_atags)
134
135/*
136 * The following fragment of code is executed with the MMU on in MMU mode,
137 * and uses absolute addresses; this is not position independent.
138 *
139 * r0 = cp#15 control register
140 * r1 = machine ID
141 * r2 = atags pointer
142 * r9 = processor ID
143 */
144 __INIT
145__mmap_switched:
146 adr r3, __mmap_switched_data
147
148 ldmia r3!, {r4, r5, r6, r7}
149 cmp r4, r5 @ Copy data segment if needed
1501: cmpne r5, r6
151 ldrne fp, [r4], #4
152 strne fp, [r5], #4
153 bne 1b
154
155 mov fp, #0 @ Clear BSS (and zero fp)
1561: cmp r6, r7
157 strcc fp, [r6],#4
158 bcc 1b
159
160 ARM( ldmia r3, {r4, r5, r6, r7, sp})
161 THUMB( ldmia r3, {r4, r5, r6, r7} )
162 THUMB( ldr sp, [r3, #16] )
163 str r9, [r4] @ Save processor ID
164 str r1, [r5] @ Save machine type
165 str r2, [r6] @ Save atags pointer
166 bic r4, r0, #CR_A @ Clear 'A' bit
167 stmia r7, {r0, r4} @ Save control register values
168 b start_kernel
169ENDPROC(__mmap_switched)
170
171 .align 2
172 .type __mmap_switched_data, %object
173__mmap_switched_data:
174 .long __data_loc @ r4
175 .long _sdata @ r5
176 .long __bss_start @ r6
177 .long _end @ r7
178 .long processor_id @ r4
179 .long __machine_arch_type @ r5
180 .long __atags_pointer @ r6
181 .long cr_alignment @ r7
182 .long init_thread_union + THREAD_START_SP @ sp
183 .size __mmap_switched_data, . - __mmap_switched_data
184
185/*
186 * This provides a C-API version of __lookup_machine_type
187 */
188ENTRY(lookup_machine_type)
189 stmfd sp!, {r4 - r6, lr}
190 mov r1, r0
191 bl __lookup_machine_type
192 mov r0, r5
193 ldmfd sp!, {r4 - r6, pc}
194ENDPROC(lookup_machine_type)
195
196/*
197 * This provides a C-API version of __lookup_processor_type
198 */
199ENTRY(lookup_processor_type)
200 stmfd sp!, {r4 - r6, r9, lr}
201 mov r9, r0
202 bl __lookup_processor_type
203 mov r0, r5
204 ldmfd sp!, {r4 - r6, r9, pc}
205ENDPROC(lookup_processor_type)
206
207/*
208 * Read processor ID register (CP#15, CR0), and look up in the linker-built
209 * supported processor list. Note that we can't use the absolute addresses
210 * for the __proc_info lists since we aren't running with the MMU on
211 * (and therefore, we are not in the correct address space). We have to
212 * calculate the offset.
213 *
214 * r9 = cpuid
215 * Returns:
216 * r3, r4, r6 corrupted
217 * r5 = proc_info pointer in physical address space
218 * r9 = cpuid (preserved)
219 */
220 __CPUINIT
221__lookup_processor_type:
222 adr r3, __lookup_processor_type_data
223 ldmia r3, {r4 - r6}
224 sub r3, r3, r4 @ get offset between virt&phys
225 add r5, r5, r3 @ convert virt addresses to
226 add r6, r6, r3 @ physical address space
2271: ldmia r5, {r3, r4} @ value, mask
228 and r4, r4, r9 @ mask wanted bits
229 teq r3, r4
230 beq 2f
231 add r5, r5, #PROC_INFO_SZ @ sizeof(proc_info_list)
232 cmp r5, r6
233 blo 1b
234 mov r5, #0 @ unknown processor
2352: mov pc, lr
236ENDPROC(__lookup_processor_type)
237
238/*
239 * Look in <asm/procinfo.h> for information about the __proc_info structure.
240 */
241 .align 2
242 .type __lookup_processor_type_data, %object
243__lookup_processor_type_data:
244 .long .
245 .long __proc_info_begin
246 .long __proc_info_end
247 .size __lookup_processor_type_data, . - __lookup_processor_type_data
248
249__error_p:
250#ifdef CONFIG_DEBUG_LL
251 adr r0, str_p1
252 bl printascii
253 mov r0, r9
254 bl printhex8
255 adr r0, str_p2
256 bl printascii
257 b __error
258str_p1: .asciz "\nError: unrecognized/unsupported processor variant (0x"
259str_p2: .asciz ").\n"
260 .align
261#endif
262ENDPROC(__error_p)
263
264__error:
265#ifdef CONFIG_ARCH_RPC
266/*
267 * Turn the screen red on a error - RiscPC only.
268 */
269 mov r0, #0x02000000
270 mov r3, #0x11
271 orr r3, r3, r3, lsl #8
272 orr r3, r3, r3, lsl #16
273 str r3, [r0], #4
274 str r3, [r0], #4
275 str r3, [r0], #4
276 str r3, [r0], #4
277#endif
2781: mov r0, r0
279 b 1b
280ENDPROC(__error)
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index 573b803dc6b..814ce1a7327 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -48,8 +48,6 @@ ENTRY(stext)
48 movs r8, r5 @ invalid machine (r5=0)? 48 movs r8, r5 @ invalid machine (r5=0)?
49 beq __error_a @ yes, error 'a' 49 beq __error_a @ yes, error 'a'
50 50
51 ldr r13, __switch_data @ address to jump to after
52 @ the initialization is done
53 adr lr, BSYM(__after_proc_init) @ return (PIC) address 51 adr lr, BSYM(__after_proc_init) @ return (PIC) address
54 ARM( add pc, r10, #PROCINFO_INITFUNC ) 52 ARM( add pc, r10, #PROCINFO_INITFUNC )
55 THUMB( add r12, r10, #PROCINFO_INITFUNC ) 53 THUMB( add r12, r10, #PROCINFO_INITFUNC )
@@ -87,8 +85,7 @@ __after_proc_init:
87 mcr p15, 0, r0, c1, c0, 0 @ write control reg 85 mcr p15, 0, r0, c1, c0, 0 @ write control reg
88#endif /* CONFIG_CPU_CP15 */ 86#endif /* CONFIG_CPU_CP15 */
89 87
90 mov r3, r13 88 b __mmap_switched @ clear the BSS and jump
91 mov pc, r3 @ clear the BSS and jump
92 @ to start_kernel 89 @ to start_kernel
93ENDPROC(__after_proc_init) 90ENDPROC(__after_proc_init)
94 .ltorg 91 .ltorg
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index b44d21e1e34..767390449e0 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -98,113 +98,15 @@ ENTRY(stext)
98 * above. On return, the CPU will be ready for the MMU to be 98 * above. On return, the CPU will be ready for the MMU to be
99 * turned on, and r0 will hold the CPU control register value. 99 * turned on, and r0 will hold the CPU control register value.
100 */ 100 */
101 ldr r13, __switch_data @ address to jump to after 101 ldr r13, =__mmap_switched @ address to jump to after
102 @ mmu has been enabled 102 @ mmu has been enabled
103 adr lr, BSYM(__enable_mmu) @ return (PIC) address 103 adr lr, BSYM(1f) @ return (PIC) address
104 ARM( add pc, r10, #PROCINFO_INITFUNC ) 104 ARM( add pc, r10, #PROCINFO_INITFUNC )
105 THUMB( add r12, r10, #PROCINFO_INITFUNC ) 105 THUMB( add r12, r10, #PROCINFO_INITFUNC )
106 THUMB( mov pc, r12 ) 106 THUMB( mov pc, r12 )
1071: b __enable_mmu
107ENDPROC(stext) 108ENDPROC(stext)
108 109 .ltorg
109#if defined(CONFIG_SMP)
110ENTRY(secondary_startup)
111 /*
112 * Common entry point for secondary CPUs.
113 *
114 * Ensure that we're in SVC mode, and IRQs are disabled. Lookup
115 * the processor type - there is no need to check the machine type
116 * as it has already been validated by the primary processor.
117 */
118 setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9
119 mrc p15, 0, r9, c0, c0 @ get processor id
120 bl __lookup_processor_type
121 movs r10, r5 @ invalid processor?
122 moveq r0, #'p' @ yes, error 'p'
123 beq __error
124
125 /*
126 * Use the page tables supplied from __cpu_up.
127 */
128 adr r4, __secondary_data
129 ldmia r4, {r5, r7, r12} @ address to jump to after
130 sub r4, r4, r5 @ mmu has been enabled
131 ldr r4, [r7, r4] @ get secondary_data.pgdir
132 adr lr, BSYM(__enable_mmu) @ return address
133 mov r13, r12 @ __secondary_switched address
134 ARM( add pc, r10, #PROCINFO_INITFUNC ) @ initialise processor
135 @ (return control reg)
136 THUMB( add r12, r10, #PROCINFO_INITFUNC )
137 THUMB( mov pc, r12 )
138ENDPROC(secondary_startup)
139
140 /*
141 * r6 = &secondary_data
142 */
143ENTRY(__secondary_switched)
144 ldr sp, [r7, #4] @ get secondary_data.stack
145 mov fp, #0
146 b secondary_start_kernel
147ENDPROC(__secondary_switched)
148
149 .type __secondary_data, %object
150__secondary_data:
151 .long .
152 .long secondary_data
153 .long __secondary_switched
154#endif /* defined(CONFIG_SMP) */
155
156
157
158/*
159 * Setup common bits before finally enabling the MMU. Essentially
160 * this is just loading the page table pointer and domain access
161 * registers.
162 */
163__enable_mmu:
164#ifdef CONFIG_ALIGNMENT_TRAP
165 orr r0, r0, #CR_A
166#else
167 bic r0, r0, #CR_A
168#endif
169#ifdef CONFIG_CPU_DCACHE_DISABLE
170 bic r0, r0, #CR_C
171#endif
172#ifdef CONFIG_CPU_BPREDICT_DISABLE
173 bic r0, r0, #CR_Z
174#endif
175#ifdef CONFIG_CPU_ICACHE_DISABLE
176 bic r0, r0, #CR_I
177#endif
178 mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
179 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
180 domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \
181 domain_val(DOMAIN_IO, DOMAIN_CLIENT))
182 mcr p15, 0, r5, c3, c0, 0 @ load domain access register
183 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
184 b __turn_mmu_on
185ENDPROC(__enable_mmu)
186
187/*
188 * Enable the MMU. This completely changes the structure of the visible
189 * memory space. You will not be able to trace execution through this.
190 * If you have an enquiry about this, *please* check the linux-arm-kernel
191 * mailing list archives BEFORE sending another post to the list.
192 *
193 * r0 = cp#15 control register
194 * r13 = *virtual* address to jump to upon completion
195 *
196 * other registers depend on the function called upon completion
197 */
198 .align 5
199__turn_mmu_on:
200 mov r0, r0
201 mcr p15, 0, r0, c1, c0, 0 @ write control reg
202 mrc p15, 0, r3, c0, c0, 0 @ read id reg
203 mov r3, r3
204 mov r3, r13
205 mov pc, r3
206ENDPROC(__turn_mmu_on)
207
208 110
209/* 111/*
210 * Setup the initial page tables. We only setup the barest 112 * Setup the initial page tables. We only setup the barest
@@ -216,7 +118,7 @@ ENDPROC(__turn_mmu_on)
216 * r10 = procinfo 118 * r10 = procinfo
217 * 119 *
218 * Returns: 120 * Returns:
219 * r0, r3, r6, r7 corrupted 121 * r0, r3, r5-r7 corrupted
220 * r4 = physical page table address 122 * r4 = physical page table address
221 */ 123 */
222__create_page_tables: 124__create_page_tables:
@@ -238,20 +140,30 @@ __create_page_tables:
238 ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags 140 ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags
239 141
240 /* 142 /*
241 * Create identity mapping for first MB of kernel to 143 * Create identity mapping to cater for __enable_mmu.
242 * cater for the MMU enable. This identity mapping 144 * This identity mapping will be removed by paging_init().
243 * will be removed by paging_init(). We use our current program
244 * counter to determine corresponding section base address.
245 */ 145 */
246 mov r6, pc 146 adr r0, __enable_mmu_loc
247 mov r6, r6, lsr #20 @ start of kernel section 147 ldmia r0, {r3, r5, r6}
248 orr r3, r7, r6, lsl #20 @ flags + kernel base 148 sub r0, r0, r3 @ virt->phys offset
249 str r3, [r4, r6, lsl #2] @ identity mapping 149 add r5, r5, r0 @ phys __enable_mmu
150 add r6, r6, r0 @ phys __enable_mmu_end
151 mov r5, r5, lsr #20
152 mov r6, r6, lsr #20
153
1541: orr r3, r7, r5, lsl #20 @ flags + kernel base
155 str r3, [r4, r5, lsl #2] @ identity mapping
156 teq r5, r6
157 addne r5, r5, #1 @ next section
158 bne 1b
250 159
251 /* 160 /*
252 * Now setup the pagetables for our kernel direct 161 * Now setup the pagetables for our kernel direct
253 * mapped region. 162 * mapped region.
254 */ 163 */
164 mov r3, pc
165 mov r3, r3, lsr #20
166 orr r3, r7, r3, lsl #20
255 add r0, r4, #(KERNEL_START & 0xff000000) >> 18 167 add r0, r4, #(KERNEL_START & 0xff000000) >> 18
256 str r3, [r0, #(KERNEL_START & 0x00f00000) >> 18]! 168 str r3, [r0, #(KERNEL_START & 0x00f00000) >> 18]!
257 ldr r6, =(KERNEL_END - 1) 169 ldr r6, =(KERNEL_END - 1)
@@ -335,6 +247,122 @@ __create_page_tables:
335 mov pc, lr 247 mov pc, lr
336ENDPROC(__create_page_tables) 248ENDPROC(__create_page_tables)
337 .ltorg 249 .ltorg
250__enable_mmu_loc:
251 .long .
252 .long __enable_mmu
253 .long __enable_mmu_end
254
255#if defined(CONFIG_SMP)
256 __CPUINIT
257ENTRY(secondary_startup)
258 /*
259 * Common entry point for secondary CPUs.
260 *
261 * Ensure that we're in SVC mode, and IRQs are disabled. Lookup
262 * the processor type - there is no need to check the machine type
263 * as it has already been validated by the primary processor.
264 */
265 setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9
266 mrc p15, 0, r9, c0, c0 @ get processor id
267 bl __lookup_processor_type
268 movs r10, r5 @ invalid processor?
269 moveq r0, #'p' @ yes, error 'p'
270 beq __error_p
271
272 /*
273 * Use the page tables supplied from __cpu_up.
274 */
275 adr r4, __secondary_data
276 ldmia r4, {r5, r7, r12} @ address to jump to after
277 sub r4, r4, r5 @ mmu has been enabled
278 ldr r4, [r7, r4] @ get secondary_data.pgdir
279 adr lr, BSYM(__enable_mmu) @ return address
280 mov r13, r12 @ __secondary_switched address
281 ARM( add pc, r10, #PROCINFO_INITFUNC ) @ initialise processor
282 @ (return control reg)
283 THUMB( add r12, r10, #PROCINFO_INITFUNC )
284 THUMB( mov pc, r12 )
285ENDPROC(secondary_startup)
286
287 /*
288 * r6 = &secondary_data
289 */
290ENTRY(__secondary_switched)
291 ldr sp, [r7, #4] @ get secondary_data.stack
292 mov fp, #0
293 b secondary_start_kernel
294ENDPROC(__secondary_switched)
295
296 .type __secondary_data, %object
297__secondary_data:
298 .long .
299 .long secondary_data
300 .long __secondary_switched
301#endif /* defined(CONFIG_SMP) */
302
303
304
305/*
306 * Setup common bits before finally enabling the MMU. Essentially
307 * this is just loading the page table pointer and domain access
308 * registers.
309 *
310 * r0 = cp#15 control register
311 * r1 = machine ID
312 * r2 = atags pointer
313 * r4 = page table pointer
314 * r9 = processor ID
315 * r13 = *virtual* address to jump to upon completion
316 */
317__enable_mmu:
318#ifdef CONFIG_ALIGNMENT_TRAP
319 orr r0, r0, #CR_A
320#else
321 bic r0, r0, #CR_A
322#endif
323#ifdef CONFIG_CPU_DCACHE_DISABLE
324 bic r0, r0, #CR_C
325#endif
326#ifdef CONFIG_CPU_BPREDICT_DISABLE
327 bic r0, r0, #CR_Z
328#endif
329#ifdef CONFIG_CPU_ICACHE_DISABLE
330 bic r0, r0, #CR_I
331#endif
332 mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
333 domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
334 domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \
335 domain_val(DOMAIN_IO, DOMAIN_CLIENT))
336 mcr p15, 0, r5, c3, c0, 0 @ load domain access register
337 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
338 b __turn_mmu_on
339ENDPROC(__enable_mmu)
340
341/*
342 * Enable the MMU. This completely changes the structure of the visible
343 * memory space. You will not be able to trace execution through this.
344 * If you have an enquiry about this, *please* check the linux-arm-kernel
345 * mailing list archives BEFORE sending another post to the list.
346 *
347 * r0 = cp#15 control register
348 * r1 = machine ID
349 * r2 = atags pointer
350 * r9 = processor ID
351 * r13 = *virtual* address to jump to upon completion
352 *
353 * other registers depend on the function called upon completion
354 */
355 .align 5
356__turn_mmu_on:
357 mov r0, r0
358 mcr p15, 0, r0, c1, c0, 0 @ write control reg
359 mrc p15, 0, r3, c0, c0, 0 @ read id reg
360 mov r3, r3
361 mov r3, r13
362 mov pc, r3
363__enable_mmu_end:
364ENDPROC(__turn_mmu_on)
365
338 366
339#ifdef CONFIG_SMP_ON_UP 367#ifdef CONFIG_SMP_ON_UP
340__fixup_smp: 368__fixup_smp:
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 32e16da5cbc..8c195959025 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -33,6 +33,7 @@
33#include <asm/pgtable.h> 33#include <asm/pgtable.h>
34#include <asm/pgalloc.h> 34#include <asm/pgalloc.h>
35#include <asm/processor.h> 35#include <asm/processor.h>
36#include <asm/sections.h>
36#include <asm/tlbflush.h> 37#include <asm/tlbflush.h>
37#include <asm/ptrace.h> 38#include <asm/ptrace.h>
38#include <asm/localtimer.h> 39#include <asm/localtimer.h>
@@ -67,12 +68,47 @@ enum ipi_msg_type {
67 IPI_CPU_STOP, 68 IPI_CPU_STOP,
68}; 69};
69 70
71static inline void identity_mapping_add(pgd_t *pgd, unsigned long start,
72 unsigned long end)
73{
74 unsigned long addr, prot;
75 pmd_t *pmd;
76
77 prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE;
78 if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
79 prot |= PMD_BIT4;
80
81 for (addr = start & PGDIR_MASK; addr < end;) {
82 pmd = pmd_offset(pgd + pgd_index(addr), addr);
83 pmd[0] = __pmd(addr | prot);
84 addr += SECTION_SIZE;
85 pmd[1] = __pmd(addr | prot);
86 addr += SECTION_SIZE;
87 flush_pmd_entry(pmd);
88 outer_clean_range(__pa(pmd), __pa(pmd + 1));
89 }
90}
91
92static inline void identity_mapping_del(pgd_t *pgd, unsigned long start,
93 unsigned long end)
94{
95 unsigned long addr;
96 pmd_t *pmd;
97
98 for (addr = start & PGDIR_MASK; addr < end; addr += PGDIR_SIZE) {
99 pmd = pmd_offset(pgd + pgd_index(addr), addr);
100 pmd[0] = __pmd(0);
101 pmd[1] = __pmd(0);
102 clean_pmd_entry(pmd);
103 outer_clean_range(__pa(pmd), __pa(pmd + 1));
104 }
105}
106
70int __cpuinit __cpu_up(unsigned int cpu) 107int __cpuinit __cpu_up(unsigned int cpu)
71{ 108{
72 struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu); 109 struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
73 struct task_struct *idle = ci->idle; 110 struct task_struct *idle = ci->idle;
74 pgd_t *pgd; 111 pgd_t *pgd;
75 pmd_t *pmd;
76 int ret; 112 int ret;
77 113
78 /* 114 /*
@@ -101,11 +137,16 @@ int __cpuinit __cpu_up(unsigned int cpu)
101 * a 1:1 mapping for the physical address of the kernel. 137 * a 1:1 mapping for the physical address of the kernel.
102 */ 138 */
103 pgd = pgd_alloc(&init_mm); 139 pgd = pgd_alloc(&init_mm);
104 pmd = pmd_offset(pgd + pgd_index(PHYS_OFFSET), PHYS_OFFSET); 140 if (!pgd)
105 *pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) | 141 return -ENOMEM;
106 PMD_TYPE_SECT | PMD_SECT_AP_WRITE); 142
107 flush_pmd_entry(pmd); 143 if (PHYS_OFFSET != PAGE_OFFSET) {
108 outer_clean_range(__pa(pmd), __pa(pmd + 1)); 144#ifndef CONFIG_HOTPLUG_CPU
145 identity_mapping_add(pgd, __pa(__init_begin), __pa(__init_end));
146#endif
147 identity_mapping_add(pgd, __pa(_stext), __pa(_etext));
148 identity_mapping_add(pgd, __pa(_sdata), __pa(_edata));
149 }
109 150
110 /* 151 /*
111 * We need to tell the secondary core where to find 152 * We need to tell the secondary core where to find
@@ -143,8 +184,14 @@ int __cpuinit __cpu_up(unsigned int cpu)
143 secondary_data.stack = NULL; 184 secondary_data.stack = NULL;
144 secondary_data.pgdir = 0; 185 secondary_data.pgdir = 0;
145 186
146 *pmd = __pmd(0); 187 if (PHYS_OFFSET != PAGE_OFFSET) {
147 clean_pmd_entry(pmd); 188#ifndef CONFIG_HOTPLUG_CPU
189 identity_mapping_del(pgd, __pa(__init_begin), __pa(__init_end));
190#endif
191 identity_mapping_del(pgd, __pa(_stext), __pa(_etext));
192 identity_mapping_del(pgd, __pa(_sdata), __pa(_edata));
193 }
194
148 pgd_free(&init_mm, pgd); 195 pgd_free(&init_mm, pgd);
149 196
150 if (ret) { 197 if (ret) {
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 065d35de0e0..1953e3d21ab 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -8,6 +8,19 @@
8#include <asm/memory.h> 8#include <asm/memory.h>
9#include <asm/page.h> 9#include <asm/page.h>
10 10
11#define PROC_INFO \
12 VMLINUX_SYMBOL(__proc_info_begin) = .; \
13 *(.proc.info.init) \
14 VMLINUX_SYMBOL(__proc_info_end) = .;
15
16#ifdef CONFIG_HOTPLUG_CPU
17#define ARM_CPU_DISCARD(x)
18#define ARM_CPU_KEEP(x) x
19#else
20#define ARM_CPU_DISCARD(x) x
21#define ARM_CPU_KEEP(x)
22#endif
23
11OUTPUT_ARCH(arm) 24OUTPUT_ARCH(arm)
12ENTRY(stext) 25ENTRY(stext)
13 26
@@ -31,9 +44,7 @@ SECTIONS
31 HEAD_TEXT 44 HEAD_TEXT
32 INIT_TEXT 45 INIT_TEXT
33 _einittext = .; 46 _einittext = .;
34 __proc_info_begin = .; 47 ARM_CPU_DISCARD(PROC_INFO)
35 *(.proc.info.init)
36 __proc_info_end = .;
37 __arch_info_begin = .; 48 __arch_info_begin = .;
38 *(.arch.info.init) 49 *(.arch.info.init)
39 __arch_info_end = .; 50 __arch_info_end = .;
@@ -73,10 +84,8 @@ SECTIONS
73 /DISCARD/ : { 84 /DISCARD/ : {
74 *(.ARM.exidx.exit.text) 85 *(.ARM.exidx.exit.text)
75 *(.ARM.extab.exit.text) 86 *(.ARM.extab.exit.text)
76#ifndef CONFIG_HOTPLUG_CPU 87 ARM_CPU_DISCARD(*(.ARM.exidx.cpuexit.text))
77 *(.ARM.exidx.cpuexit.text) 88 ARM_CPU_DISCARD(*(.ARM.extab.cpuexit.text))
78 *(.ARM.extab.cpuexit.text)
79#endif
80#ifndef CONFIG_HOTPLUG 89#ifndef CONFIG_HOTPLUG
81 *(.ARM.exidx.devexit.text) 90 *(.ARM.exidx.devexit.text)
82 *(.ARM.extab.devexit.text) 91 *(.ARM.extab.devexit.text)
@@ -105,6 +114,7 @@ SECTIONS
105 *(.glue_7) 114 *(.glue_7)
106 *(.glue_7t) 115 *(.glue_7t)
107 *(.got) /* Global offset table */ 116 *(.got) /* Global offset table */
117 ARM_CPU_KEEP(PROC_INFO)
108 } 118 }
109 119
110 RO_DATA(PAGE_SIZE) 120 RO_DATA(PAGE_SIZE)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 12:37:27 -0500