1/* SPDX-License-Identifier: GPL-2.0 */ 2#include <linux/linkage.h> 3#include <linux/threads.h> 4#include <asm/asm-offsets.h> 5#include <asm/assembler.h> 6#include <asm/glue-cache.h> 7#include <asm/glue-proc.h> 8 .text 9 10/* 11 * Implementation of MPIDR hash algorithm through shifting 12 * and OR'ing. 13 * 14 * @dst: register containing hash result 15 * @rs0: register containing affinity level 0 bit shift 16 * @rs1: register containing affinity level 1 bit shift 17 * @rs2: register containing affinity level 2 bit shift 18 * @mpidr: register containing MPIDR value 19 * @mask: register containing MPIDR mask 20 * 21 * Pseudo C-code: 22 * 23 *u32 dst; 24 * 25 *compute_mpidr_hash(u32 rs0, u32 rs1, u32 rs2, u32 mpidr, u32 mask) { 26 * u32 aff0, aff1, aff2; 27 * u32 mpidr_masked = mpidr & mask; 28 * aff0 = mpidr_masked & 0xff; 29 * aff1 = mpidr_masked & 0xff00; 30 * aff2 = mpidr_masked & 0xff0000; 31 * dst = (aff0 >> rs0 | aff1 >> rs1 | aff2 >> rs2); 32 *} 33 * Input registers: rs0, rs1, rs2, mpidr, mask 34 * Output register: dst 35 * Note: input and output registers must be disjoint register sets 36 (eg: a macro instance with mpidr = r1 and dst = r1 is invalid) 37 */ 38 .macro compute_mpidr_hash dst, rs0, rs1, rs2, mpidr, mask 39 and \mpidr, \mpidr, \mask @ mask out MPIDR bits 40 and \dst, \mpidr, #0xff @ mask=aff0 41 ARM( mov \dst, \dst, lsr \rs0 ) @ dst=aff0>>rs0 42 THUMB( lsr \dst, \dst, \rs0 ) 43 and \mask, \mpidr, #0xff00 @ mask = aff1 44 ARM( orr \dst, \dst, \mask, lsr \rs1 ) @ dst|=(aff1>>rs1) 45 THUMB( lsr \mask, \mask, \rs1 ) 46 THUMB( orr \dst, \dst, \mask ) 47 and \mask, \mpidr, #0xff0000 @ mask = aff2 48 ARM( orr \dst, \dst, \mask, lsr \rs2 ) @ dst|=(aff2>>rs2) 49 THUMB( lsr \mask, \mask, \rs2 ) 50 THUMB( orr \dst, \dst, \mask ) 51 .endm 52 53/* 54 * Save CPU state for a suspend. This saves the CPU general purpose 55 * registers, and allocates space on the kernel stack to save the CPU 56 * specific registers and some other data for resume. 57 * r0 = suspend function arg0 58 * r1 = suspend function 59 * r2 = MPIDR value the resuming CPU will use 60 */ 61ENTRY(__cpu_suspend) 62 stmfd sp!, {r4 - r11, lr} 63#ifdef MULTI_CPU 64 ldr r10, =processor 65 ldr r4, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state 66#else 67 ldr r4, =cpu_suspend_size 68#endif 69 mov r5, sp @ current virtual SP 70 add r4, r4, #12 @ Space for pgd, virt sp, phys resume fn 71 sub sp, sp, r4 @ allocate CPU state on stack 72 ldr r3, =sleep_save_sp 73 stmfd sp!, {r0, r1} @ save suspend func arg and pointer 74 ldr r3, [r3, #SLEEP_SAVE_SP_VIRT] 75 ALT_SMP(ldr r0, =mpidr_hash) 76 ALT_UP_B(1f) 77 /* This ldmia relies on the memory layout of the mpidr_hash struct */ 78 ldmia r0, {r1, r6-r8} @ r1 = mpidr mask (r6,r7,r8) = l[0,1,2] shifts 79 compute_mpidr_hash r0, r6, r7, r8, r2, r1 80 add r3, r3, r0, lsl #2 811: mov r2, r5 @ virtual SP 82 mov r1, r4 @ size of save block 83 add r0, sp, #8 @ pointer to save block 84 bl __cpu_suspend_save 85 badr lr, cpu_suspend_abort 86 ldmfd sp!, {r0, pc} @ call suspend fn 87ENDPROC(__cpu_suspend) 88 .ltorg 89 90cpu_suspend_abort: 91 ldmia sp!, {r1 - r3} @ pop phys pgd, virt SP, phys resume fn 92 teq r0, #0 93 moveq r0, #1 @ force non-zero value 94 mov sp, r2 95 ldmfd sp!, {r4 - r11, pc} 96ENDPROC(cpu_suspend_abort) 97 98/* 99 * r0 = control register value 100 */ 101 .align 5 102 .pushsection .idmap.text,"ax" 103ENTRY(cpu_resume_mmu) 104 ldr r3, =cpu_resume_after_mmu 105 instr_sync 106 mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc 107 mrc p15, 0, r0, c0, c0, 0 @ read id reg 108 instr_sync 109 mov r0, r0 110 mov r0, r0 111 ret r3 @ jump to virtual address 112ENDPROC(cpu_resume_mmu) 113 .popsection 114cpu_resume_after_mmu: 115 bl cpu_init @ restore the und/abt/irq banked regs 116 mov r0, #0 @ return zero on success 117 ldmfd sp!, {r4 - r11, pc} 118ENDPROC(cpu_resume_after_mmu) 119 120 .text 121 .align 122 123#ifdef CONFIG_MCPM 124 .arm 125THUMB( .thumb ) 126ENTRY(cpu_resume_no_hyp) 127ARM_BE8(setend be) @ ensure we are in BE mode 128 b no_hyp 129#endif 130 131#ifdef CONFIG_MMU 132 .arm 133ENTRY(cpu_resume_arm) 134 THUMB( badr r9, 1f ) @ Kernel is entered in ARM. 135 THUMB( bx r9 ) @ If this is a Thumb-2 kernel, 136 THUMB( .thumb ) @ switch to Thumb now. 137 THUMB(1: ) 138#endif 139 140ENTRY(cpu_resume) 141ARM_BE8(setend be) @ ensure we are in BE mode 142#ifdef CONFIG_ARM_VIRT_EXT 143 bl __hyp_stub_install_secondary 144#endif 145 safe_svcmode_maskall r1 146no_hyp: 147 mov r1, #0 148 ALT_SMP(mrc p15, 0, r0, c0, c0, 5) 149 ALT_UP_B(1f) 150 adr r2, mpidr_hash_ptr 151 ldr r3, [r2] 152 add r2, r2, r3 @ r2 = struct mpidr_hash phys address 153 /* 154 * This ldmia relies on the memory layout of the mpidr_hash 155 * struct mpidr_hash. 156 */ 157 ldmia r2, { r3-r6 } @ r3 = mpidr mask (r4,r5,r6) = l[0,1,2] shifts 158 compute_mpidr_hash r1, r4, r5, r6, r0, r3 1591: 160 adr r0, _sleep_save_sp 161 ldr r2, [r0] 162 add r0, r0, r2 163 ldr r0, [r0, #SLEEP_SAVE_SP_PHYS] 164 ldr r0, [r0, r1, lsl #2] 165 166 @ load phys pgd, stack, resume fn 167 ARM( ldmia r0!, {r1, sp, pc} ) 168THUMB( ldmia r0!, {r1, r2, r3} ) 169THUMB( mov sp, r2 ) 170THUMB( bx r3 ) 171ENDPROC(cpu_resume) 172 173#ifdef CONFIG_MMU 174ENDPROC(cpu_resume_arm) 175#endif 176#ifdef CONFIG_MCPM 177ENDPROC(cpu_resume_no_hyp) 178#endif 179 180 .align 2 181_sleep_save_sp: 182 .long sleep_save_sp - . 183mpidr_hash_ptr: 184 .long mpidr_hash - . @ mpidr_hash struct offset 185 186 .data 187 .align 2 188 .type sleep_save_sp, #object 189ENTRY(sleep_save_sp) 190 .space SLEEP_SAVE_SP_SZ @ struct sleep_save_sp 191