forked from Minki/linux
8b806b82bc
When onlining a CPU, switch to swapper_pg_dir as soon as possible so that it is guaranteed that the vmap'ed stack is mapped before it is used. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
195 lines
5.4 KiB
ArmAsm
195 lines
5.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/linkage.h>
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#include <linux/threads.h>
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#include <asm/asm-offsets.h>
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#include <asm/assembler.h>
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#include <asm/glue-cache.h>
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#include <asm/glue-proc.h>
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.text
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/*
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* Implementation of MPIDR 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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* @mpidr: register containing MPIDR 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 mpidr, u32 mask) {
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* u32 aff0, aff1, aff2;
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* u32 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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* dst = (aff0 >> rs0 | aff1 >> rs1 | aff2 >> rs2);
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*}
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* Input registers: rs0, rs1, rs2, 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 = r1 and dst = r1 is invalid)
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*/
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.macro compute_mpidr_hash dst, rs0, rs1, rs2, 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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ARM( mov \dst, \dst, lsr \rs0 ) @ dst=aff0>>rs0
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THUMB( lsr \dst, \dst, \rs0 )
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and \mask, \mpidr, #0xff00 @ mask = aff1
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ARM( orr \dst, \dst, \mask, lsr \rs1 ) @ dst|=(aff1>>rs1)
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THUMB( lsr \mask, \mask, \rs1 )
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THUMB( orr \dst, \dst, \mask )
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and \mask, \mpidr, #0xff0000 @ mask = aff2
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ARM( orr \dst, \dst, \mask, lsr \rs2 ) @ dst|=(aff2>>rs2)
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THUMB( lsr \mask, \mask, \rs2 )
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THUMB( orr \dst, \dst, \mask )
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.endm
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/*
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* Save CPU state for a suspend. This saves the CPU general purpose
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* registers, and allocates space on the kernel stack to save the CPU
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* specific registers and some other data for resume.
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* r0 = suspend function arg0
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* r1 = suspend function
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* r2 = MPIDR value the resuming CPU will use
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*/
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ENTRY(__cpu_suspend)
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stmfd sp!, {r4 - r11, lr}
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#ifdef MULTI_CPU
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ldr r10, =processor
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ldr r4, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state
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#else
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ldr r4, =cpu_suspend_size
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#endif
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mov r5, sp @ current virtual SP
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#ifdef CONFIG_VMAP_STACK
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@ Run the suspend code from the overflow stack so we don't have to rely
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@ on vmalloc-to-phys conversions anywhere in the arch suspend code.
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@ The original SP value captured in R5 will be restored on the way out.
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ldr_this_cpu sp, overflow_stack_ptr, r6, r7
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#endif
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add r4, r4, #12 @ Space for pgd, virt sp, phys resume fn
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sub sp, sp, r4 @ allocate CPU state on stack
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ldr r3, =sleep_save_sp
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stmfd sp!, {r0, r1} @ save suspend func arg and pointer
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ldr r3, [r3, #SLEEP_SAVE_SP_VIRT]
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ALT_SMP(W(nop)) @ don't use adr_l inside ALT_SMP()
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ALT_UP_B(1f)
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adr_l r0, mpidr_hash
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/* This ldmia relies on the memory layout of the mpidr_hash struct */
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ldmia r0, {r1, r6-r8} @ r1 = mpidr mask (r6,r7,r8) = l[0,1,2] shifts
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compute_mpidr_hash r0, r6, r7, r8, r2, r1
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add r3, r3, r0, lsl #2
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1: mov r2, r5 @ virtual SP
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mov r1, r4 @ size of save block
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add r0, sp, #8 @ pointer to save block
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bl __cpu_suspend_save
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badr lr, cpu_suspend_abort
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ldmfd sp!, {r0, pc} @ call suspend fn
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ENDPROC(__cpu_suspend)
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.ltorg
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cpu_suspend_abort:
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ldmia sp!, {r1 - r3} @ pop phys pgd, virt SP, phys resume fn
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teq r0, #0
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moveq r0, #1 @ force non-zero value
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mov sp, r2
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ldmfd sp!, {r4 - r11, pc}
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ENDPROC(cpu_suspend_abort)
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/*
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* r0 = control register value
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*/
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.align 5
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.pushsection .idmap.text,"ax"
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ENTRY(cpu_resume_mmu)
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ldr r3, =cpu_resume_after_mmu
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instr_sync
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mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc
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mrc p15, 0, r0, c0, c0, 0 @ read id reg
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instr_sync
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mov r0, r0
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mov r0, r0
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ret r3 @ jump to virtual address
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ENDPROC(cpu_resume_mmu)
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.popsection
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cpu_resume_after_mmu:
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#if defined(CONFIG_VMAP_STACK) && !defined(CONFIG_ARM_LPAE)
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@ Before using the vmap'ed stack, we have to switch to swapper_pg_dir
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@ as the ID map does not cover the vmalloc region.
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mrc p15, 0, ip, c2, c0, 1 @ read TTBR1
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mcr p15, 0, ip, c2, c0, 0 @ set TTBR0
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instr_sync
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#endif
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bl cpu_init @ restore the und/abt/irq banked regs
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mov r0, #0 @ return zero on success
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ldmfd sp!, {r4 - r11, pc}
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ENDPROC(cpu_resume_after_mmu)
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.text
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.align
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#ifdef CONFIG_MCPM
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.arm
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THUMB( .thumb )
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ENTRY(cpu_resume_no_hyp)
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ARM_BE8(setend be) @ ensure we are in BE mode
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b no_hyp
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#endif
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#ifdef CONFIG_MMU
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.arm
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ENTRY(cpu_resume_arm)
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THUMB( badr r9, 1f ) @ Kernel is entered in ARM.
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THUMB( bx r9 ) @ If this is a Thumb-2 kernel,
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THUMB( .thumb ) @ switch to Thumb now.
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THUMB(1: )
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#endif
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ENTRY(cpu_resume)
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ARM_BE8(setend be) @ ensure we are in BE mode
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#ifdef CONFIG_ARM_VIRT_EXT
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bl __hyp_stub_install_secondary
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#endif
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safe_svcmode_maskall r1
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no_hyp:
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mov r1, #0
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ALT_SMP(mrc p15, 0, r0, c0, c0, 5)
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ALT_UP_B(1f)
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adr_l r2, mpidr_hash @ r2 = struct mpidr_hash phys address
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/*
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* This ldmia relies on the memory layout of the mpidr_hash
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* struct mpidr_hash.
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*/
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ldmia r2, { r3-r6 } @ r3 = mpidr mask (r4,r5,r6) = l[0,1,2] shifts
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compute_mpidr_hash r1, r4, r5, r6, r0, r3
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1:
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ldr_l r0, sleep_save_sp + SLEEP_SAVE_SP_PHYS
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ldr r0, [r0, r1, lsl #2]
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@ load phys pgd, stack, resume fn
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ARM( ldmia r0!, {r1, sp, pc} )
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THUMB( ldmia r0!, {r1, r2, r3} )
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THUMB( mov sp, r2 )
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THUMB( bx r3 )
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ENDPROC(cpu_resume)
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#ifdef CONFIG_MMU
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ENDPROC(cpu_resume_arm)
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#endif
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#ifdef CONFIG_MCPM
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ENDPROC(cpu_resume_no_hyp)
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#endif
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.data
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.align 2
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.type sleep_save_sp, #object
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ENTRY(sleep_save_sp)
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.space SLEEP_SAVE_SP_SZ @ struct sleep_save_sp
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