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150 lines
4.5 KiB
150 lines
4.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#include <linux/errno.h> |
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#include <linux/linkage.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/assembler.h> |
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#include <asm/smp.h> |
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.text |
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/* |
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* Implementation of MPIDR_EL1 hash algorithm through shifting |
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* and OR'ing. |
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* |
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* @dst: register containing hash result |
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* @rs0: register containing affinity level 0 bit shift |
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* @rs1: register containing affinity level 1 bit shift |
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* @rs2: register containing affinity level 2 bit shift |
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* @rs3: register containing affinity level 3 bit shift |
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* @mpidr: register containing MPIDR_EL1 value |
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* @mask: register containing MPIDR mask |
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* |
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* Pseudo C-code: |
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* |
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*u32 dst; |
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* |
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*compute_mpidr_hash(u32 rs0, u32 rs1, u32 rs2, u32 rs3, u64 mpidr, u64 mask) { |
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* u32 aff0, aff1, aff2, aff3; |
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* u64 mpidr_masked = mpidr & mask; |
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* aff0 = mpidr_masked & 0xff; |
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* aff1 = mpidr_masked & 0xff00; |
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* aff2 = mpidr_masked & 0xff0000; |
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* aff3 = mpidr_masked & 0xff00000000; |
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* dst = (aff0 >> rs0 | aff1 >> rs1 | aff2 >> rs2 | aff3 >> rs3); |
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*} |
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* Input registers: rs0, rs1, rs2, rs3, mpidr, mask |
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* Output register: dst |
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* Note: input and output registers must be disjoint register sets |
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(eg: a macro instance with mpidr = x1 and dst = x1 is invalid) |
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*/ |
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.macro compute_mpidr_hash dst, rs0, rs1, rs2, rs3, mpidr, mask |
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and \mpidr, \mpidr, \mask // mask out MPIDR bits |
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and \dst, \mpidr, #0xff // mask=aff0 |
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lsr \dst ,\dst, \rs0 // dst=aff0>>rs0 |
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and \mask, \mpidr, #0xff00 // mask = aff1 |
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lsr \mask ,\mask, \rs1 |
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orr \dst, \dst, \mask // dst|=(aff1>>rs1) |
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and \mask, \mpidr, #0xff0000 // mask = aff2 |
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lsr \mask ,\mask, \rs2 |
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orr \dst, \dst, \mask // dst|=(aff2>>rs2) |
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and \mask, \mpidr, #0xff00000000 // mask = aff3 |
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lsr \mask ,\mask, \rs3 |
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orr \dst, \dst, \mask // dst|=(aff3>>rs3) |
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.endm |
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/* |
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* Save CPU state in the provided sleep_stack_data area, and publish its |
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* location for cpu_resume()'s use in sleep_save_stash. |
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* |
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* cpu_resume() will restore this saved state, and return. Because the |
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* link-register is saved and restored, it will appear to return from this |
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* function. So that the caller can tell the suspend/resume paths apart, |
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* __cpu_suspend_enter() will always return a non-zero value, whereas the |
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* path through cpu_resume() will return 0. |
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* |
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* x0 = struct sleep_stack_data area |
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*/ |
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SYM_FUNC_START(__cpu_suspend_enter) |
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stp x29, lr, [x0, #SLEEP_STACK_DATA_CALLEE_REGS] |
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stp x19, x20, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+16] |
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stp x21, x22, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+32] |
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stp x23, x24, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+48] |
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stp x25, x26, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+64] |
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stp x27, x28, [x0,#SLEEP_STACK_DATA_CALLEE_REGS+80] |
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/* save the sp in cpu_suspend_ctx */ |
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mov x2, sp |
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str x2, [x0, #SLEEP_STACK_DATA_SYSTEM_REGS + CPU_CTX_SP] |
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/* find the mpidr_hash */ |
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ldr_l x1, sleep_save_stash |
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mrs x7, mpidr_el1 |
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adr_l x9, mpidr_hash |
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ldr x10, [x9, #MPIDR_HASH_MASK] |
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/* |
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* Following code relies on the struct mpidr_hash |
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* members size. |
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*/ |
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ldp w3, w4, [x9, #MPIDR_HASH_SHIFTS] |
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ldp w5, w6, [x9, #(MPIDR_HASH_SHIFTS + 8)] |
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compute_mpidr_hash x8, x3, x4, x5, x6, x7, x10 |
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add x1, x1, x8, lsl #3 |
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str x0, [x1] |
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add x0, x0, #SLEEP_STACK_DATA_SYSTEM_REGS |
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stp x29, lr, [sp, #-16]! |
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bl cpu_do_suspend |
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ldp x29, lr, [sp], #16 |
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mov x0, #1 |
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ret |
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SYM_FUNC_END(__cpu_suspend_enter) |
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.pushsection ".idmap.text", "awx" |
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SYM_CODE_START(cpu_resume) |
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bl init_kernel_el |
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bl switch_to_vhe |
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bl __cpu_setup |
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/* enable the MMU early - so we can access sleep_save_stash by va */ |
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adrp x1, swapper_pg_dir |
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bl __enable_mmu |
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ldr x8, =_cpu_resume |
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br x8 |
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SYM_CODE_END(cpu_resume) |
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.ltorg |
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.popsection |
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SYM_FUNC_START(_cpu_resume) |
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mrs x1, mpidr_el1 |
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adr_l x8, mpidr_hash // x8 = struct mpidr_hash virt address |
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/* retrieve mpidr_hash members to compute the hash */ |
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ldr x2, [x8, #MPIDR_HASH_MASK] |
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ldp w3, w4, [x8, #MPIDR_HASH_SHIFTS] |
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ldp w5, w6, [x8, #(MPIDR_HASH_SHIFTS + 8)] |
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compute_mpidr_hash x7, x3, x4, x5, x6, x1, x2 |
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/* x7 contains hash index, let's use it to grab context pointer */ |
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ldr_l x0, sleep_save_stash |
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ldr x0, [x0, x7, lsl #3] |
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add x29, x0, #SLEEP_STACK_DATA_CALLEE_REGS |
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add x0, x0, #SLEEP_STACK_DATA_SYSTEM_REGS |
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/* load sp from context */ |
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ldr x2, [x0, #CPU_CTX_SP] |
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mov sp, x2 |
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/* |
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* cpu_do_resume expects x0 to contain context address pointer |
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*/ |
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bl cpu_do_resume |
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#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK) |
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mov x0, sp |
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bl kasan_unpoison_task_stack_below |
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#endif |
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ldp x19, x20, [x29, #16] |
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ldp x21, x22, [x29, #32] |
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ldp x23, x24, [x29, #48] |
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ldp x25, x26, [x29, #64] |
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ldp x27, x28, [x29, #80] |
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ldp x29, lr, [x29] |
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mov x0, #0 |
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ret |
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SYM_FUNC_END(_cpu_resume)
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