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1#include <linux/linkage.h>
2#include <linux/threads.h>
3#include <asm/asm-offsets.h>
4#include <asm/assembler.h>
5#include <asm/glue-cache.h>
6#include <asm/glue-proc.h>
7 .text
8
9/*
10 * Implementation of MPIDR hash algorithm through shifting
11 * and OR'ing.
12 *
13 * @dst: register containing hash result
14 * @rs0: register containing affinity level 0 bit shift
15 * @rs1: register containing affinity level 1 bit shift
16 * @rs2: register containing affinity level 2 bit shift
17 * @mpidr: register containing MPIDR value
18 * @mask: register containing MPIDR mask
19 *
20 * Pseudo C-code:
21 *
22 *u32 dst;
23 *
24 *compute_mpidr_hash(u32 rs0, u32 rs1, u32 rs2, u32 mpidr, u32 mask) {
25 * u32 aff0, aff1, aff2;
26 * u32 mpidr_masked = mpidr & mask;
27 * aff0 = mpidr_masked & 0xff;
28 * aff1 = mpidr_masked & 0xff00;
29 * aff2 = mpidr_masked & 0xff0000;
30 * dst = (aff0 >> rs0 | aff1 >> rs1 | aff2 >> rs2);
31 *}
32 * Input registers: rs0, rs1, rs2, mpidr, mask
33 * Output register: dst
34 * Note: input and output registers must be disjoint register sets
35 (eg: a macro instance with mpidr = r1 and dst = r1 is invalid)
36 */
37 .macro compute_mpidr_hash dst, rs0, rs1, rs2, mpidr, mask
38 and \mpidr, \mpidr, \mask @ mask out MPIDR bits
39 and \dst, \mpidr, #0xff @ mask=aff0
40 ARM( mov \dst, \dst, lsr \rs0 ) @ dst=aff0>>rs0
41 THUMB( lsr \dst, \dst, \rs0 )
42 and \mask, \mpidr, #0xff00 @ mask = aff1
43 ARM( orr \dst, \dst, \mask, lsr \rs1 ) @ dst|=(aff1>>rs1)
44 THUMB( lsr \mask, \mask, \rs1 )
45 THUMB( orr \dst, \dst, \mask )
46 and \mask, \mpidr, #0xff0000 @ mask = aff2
47 ARM( orr \dst, \dst, \mask, lsr \rs2 ) @ dst|=(aff2>>rs2)
48 THUMB( lsr \mask, \mask, \rs2 )
49 THUMB( orr \dst, \dst, \mask )
50 .endm
51
52/*
53 * Save CPU state for a suspend. This saves the CPU general purpose
54 * registers, and allocates space on the kernel stack to save the CPU
55 * specific registers and some other data for resume.
56 * r0 = suspend function arg0
57 * r1 = suspend function
58 * r2 = MPIDR value the resuming CPU will use
59 */
60ENTRY(__cpu_suspend)
61 stmfd sp!, {r4 - r11, lr}
62#ifdef MULTI_CPU
63 ldr r10, =processor
64 ldr r4, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state
65#else
66 ldr r4, =cpu_suspend_size
67#endif
68 mov r5, sp @ current virtual SP
69 add r4, r4, #12 @ Space for pgd, virt sp, phys resume fn
70 sub sp, sp, r4 @ allocate CPU state on stack
71 ldr r3, =sleep_save_sp
72 stmfd sp!, {r0, r1} @ save suspend func arg and pointer
73 ldr r3, [r3, #SLEEP_SAVE_SP_VIRT]
74 ALT_SMP(ldr r0, =mpidr_hash)
75 ALT_UP_B(1f)
76 /* This ldmia relies on the memory layout of the mpidr_hash struct */
77 ldmia r0, {r1, r6-r8} @ r1 = mpidr mask (r6,r7,r8) = l[0,1,2] shifts
78 compute_mpidr_hash r0, r6, r7, r8, r2, r1
79 add r3, r3, r0, lsl #2
801: mov r2, r5 @ virtual SP
81 mov r1, r4 @ size of save block
82 add r0, sp, #8 @ pointer to save block
83 bl __cpu_suspend_save
84 badr lr, cpu_suspend_abort
85 ldmfd sp!, {r0, pc} @ call suspend fn
86ENDPROC(__cpu_suspend)
87 .ltorg
88
89cpu_suspend_abort:
90 ldmia sp!, {r1 - r3} @ pop phys pgd, virt SP, phys resume fn
91 teq r0, #0
92 moveq r0, #1 @ force non-zero value
93 mov sp, r2
94 ldmfd sp!, {r4 - r11, pc}
95ENDPROC(cpu_suspend_abort)
96
97/*
98 * r0 = control register value
99 */
100 .align 5
101 .pushsection .idmap.text,"ax"
102ENTRY(cpu_resume_mmu)
103 ldr r3, =cpu_resume_after_mmu
104 instr_sync
105 mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc
106 mrc p15, 0, r0, c0, c0, 0 @ read id reg
107 instr_sync
108 mov r0, r0
109 mov r0, r0
110 ret r3 @ jump to virtual address
111ENDPROC(cpu_resume_mmu)
112 .popsection
113cpu_resume_after_mmu:
114 bl cpu_init @ restore the und/abt/irq banked regs
115 mov r0, #0 @ return zero on success
116 ldmfd sp!, {r4 - r11, pc}
117ENDPROC(cpu_resume_after_mmu)
118
119 .text
120 .align
121
122#ifdef CONFIG_MMU
123 .arm
124ENTRY(cpu_resume_arm)
125 THUMB( badr r9, 1f ) @ Kernel is entered in ARM.
126 THUMB( bx r9 ) @ If this is a Thumb-2 kernel,
127 THUMB( .thumb ) @ switch to Thumb now.
128 THUMB(1: )
129#endif
130
131ENTRY(cpu_resume)
132ARM_BE8(setend be) @ ensure we are in BE mode
133#ifdef CONFIG_ARM_VIRT_EXT
134 bl __hyp_stub_install_secondary
135#endif
136 safe_svcmode_maskall r1
137 mov r1, #0
138 ALT_SMP(mrc p15, 0, r0, c0, c0, 5)
139 ALT_UP_B(1f)
140 adr r2, mpidr_hash_ptr
141 ldr r3, [r2]
142 add r2, r2, r3 @ r2 = struct mpidr_hash phys address
143 /*
144 * This ldmia relies on the memory layout of the mpidr_hash
145 * struct mpidr_hash.
146 */
147 ldmia r2, { r3-r6 } @ r3 = mpidr mask (r4,r5,r6) = l[0,1,2] shifts
148 compute_mpidr_hash r1, r4, r5, r6, r0, r3
1491:
150 adr r0, _sleep_save_sp
151 ldr r2, [r0]
152 add r0, r0, r2
153 ldr r0, [r0, #SLEEP_SAVE_SP_PHYS]
154 ldr r0, [r0, r1, lsl #2]
155
156 @ load phys pgd, stack, resume fn
157 ARM( ldmia r0!, {r1, sp, pc} )
158THUMB( ldmia r0!, {r1, r2, r3} )
159THUMB( mov sp, r2 )
160THUMB( bx r3 )
161ENDPROC(cpu_resume)
162
163#ifdef CONFIG_MMU
164ENDPROC(cpu_resume_arm)
165#endif
166
167 .align 2
168_sleep_save_sp:
169 .long sleep_save_sp - .
170mpidr_hash_ptr:
171 .long mpidr_hash - . @ mpidr_hash struct offset
172
173 .data
174 .type sleep_save_sp, #object
175ENTRY(sleep_save_sp)
176 .space SLEEP_SAVE_SP_SZ @ struct sleep_save_sp
1#include <linux/linkage.h>
2#include <linux/threads.h>
3#include <asm/asm-offsets.h>
4#include <asm/assembler.h>
5#include <asm/glue-cache.h>
6#include <asm/glue-proc.h>
7#include <asm/system.h>
8 .text
9
10/*
11 * Save CPU state for a suspend
12 * r1 = v:p offset
13 * r2 = suspend function arg0
14 * r3 = suspend function
15 */
16ENTRY(__cpu_suspend)
17 stmfd sp!, {r4 - r11, lr}
18#ifdef MULTI_CPU
19 ldr r10, =processor
20 ldr r5, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state
21 ldr ip, [r10, #CPU_DO_RESUME] @ virtual resume function
22#else
23 ldr r5, =cpu_suspend_size
24 ldr ip, =cpu_do_resume
25#endif
26 mov r6, sp @ current virtual SP
27 sub sp, sp, r5 @ allocate CPU state on stack
28 mov r0, sp @ save pointer to CPU save block
29 add ip, ip, r1 @ convert resume fn to phys
30 stmfd sp!, {r1, r6, ip} @ save v:p, virt SP, phys resume fn
31 ldr r5, =sleep_save_sp
32 add r6, sp, r1 @ convert SP to phys
33 stmfd sp!, {r2, r3} @ save suspend func arg and pointer
34#ifdef CONFIG_SMP
35 ALT_SMP(mrc p15, 0, lr, c0, c0, 5)
36 ALT_UP(mov lr, #0)
37 and lr, lr, #15
38 str r6, [r5, lr, lsl #2] @ save phys SP
39#else
40 str r6, [r5] @ save phys SP
41#endif
42#ifdef MULTI_CPU
43 mov lr, pc
44 ldr pc, [r10, #CPU_DO_SUSPEND] @ save CPU state
45#else
46 bl cpu_do_suspend
47#endif
48
49 @ flush data cache
50#ifdef MULTI_CACHE
51 ldr r10, =cpu_cache
52 mov lr, pc
53 ldr pc, [r10, #CACHE_FLUSH_KERN_ALL]
54#else
55 bl __cpuc_flush_kern_all
56#endif
57 adr lr, BSYM(cpu_suspend_abort)
58 ldmfd sp!, {r0, pc} @ call suspend fn
59ENDPROC(__cpu_suspend)
60 .ltorg
61
62cpu_suspend_abort:
63 ldmia sp!, {r1 - r3} @ pop v:p, virt SP, phys resume fn
64 mov sp, r2
65 ldmfd sp!, {r4 - r11, pc}
66ENDPROC(cpu_suspend_abort)
67
68/*
69 * r0 = control register value
70 * r1 = v:p offset (preserved by cpu_do_resume)
71 * r2 = phys page table base
72 * r3 = L1 section flags
73 */
74ENTRY(cpu_resume_mmu)
75 adr r4, cpu_resume_turn_mmu_on
76 mov r4, r4, lsr #20
77 orr r3, r3, r4, lsl #20
78 ldr r5, [r2, r4, lsl #2] @ save old mapping
79 str r3, [r2, r4, lsl #2] @ setup 1:1 mapping for mmu code
80 sub r2, r2, r1
81 ldr r3, =cpu_resume_after_mmu
82 bic r1, r0, #CR_C @ ensure D-cache is disabled
83 b cpu_resume_turn_mmu_on
84ENDPROC(cpu_resume_mmu)
85 .ltorg
86 .align 5
87cpu_resume_turn_mmu_on:
88 mcr p15, 0, r1, c1, c0, 0 @ turn on MMU, I-cache, etc
89 mrc p15, 0, r1, c0, c0, 0 @ read id reg
90 mov r1, r1
91 mov r1, r1
92 mov pc, r3 @ jump to virtual address
93ENDPROC(cpu_resume_turn_mmu_on)
94cpu_resume_after_mmu:
95 str r5, [r2, r4, lsl #2] @ restore old mapping
96 mcr p15, 0, r0, c1, c0, 0 @ turn on D-cache
97 bl cpu_init @ restore the und/abt/irq banked regs
98 mov r0, #0 @ return zero on success
99 ldmfd sp!, {r4 - r11, pc}
100ENDPROC(cpu_resume_after_mmu)
101
102/*
103 * Note: Yes, part of the following code is located into the .data section.
104 * This is to allow sleep_save_sp to be accessed with a relative load
105 * while we can't rely on any MMU translation. We could have put
106 * sleep_save_sp in the .text section as well, but some setups might
107 * insist on it to be truly read-only.
108 */
109 .data
110 .align
111ENTRY(cpu_resume)
112#ifdef CONFIG_SMP
113 adr r0, sleep_save_sp
114 ALT_SMP(mrc p15, 0, r1, c0, c0, 5)
115 ALT_UP(mov r1, #0)
116 and r1, r1, #15
117 ldr r0, [r0, r1, lsl #2] @ stack phys addr
118#else
119 ldr r0, sleep_save_sp @ stack phys addr
120#endif
121 setmode PSR_I_BIT | PSR_F_BIT | SVC_MODE, r1 @ set SVC, irqs off
122 @ load v:p, stack, resume fn
123 ARM( ldmia r0!, {r1, sp, pc} )
124THUMB( ldmia r0!, {r1, r2, r3} )
125THUMB( mov sp, r2 )
126THUMB( bx r3 )
127ENDPROC(cpu_resume)
128
129sleep_save_sp:
130 .rept CONFIG_NR_CPUS
131 .long 0 @ preserve stack phys ptr here
132 .endr