mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 22:46:41 +07:00
5003dbde45
Kexec and hibernate need to copy pages of memory, but may not have all of the kernel mapped, and are unable to call copy_page(). Add a simplistic copy_page() macro, that can be inlined in these situations. lib/copy_page.S provides a bigger better version, but uses more registers. Signed-off-by: Geoff Levand <geoff@infradead.org> [Changed asm label to 9998, added commit message] Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
344 lines
7.8 KiB
C
344 lines
7.8 KiB
C
/*
|
|
* Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
|
|
*
|
|
* Copyright (C) 1996-2000 Russell King
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
#error "Only include this from assembly code"
|
|
#endif
|
|
|
|
#ifndef __ASM_ASSEMBLER_H
|
|
#define __ASM_ASSEMBLER_H
|
|
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable-hwdef.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/thread_info.h>
|
|
|
|
/*
|
|
* Enable and disable interrupts.
|
|
*/
|
|
.macro disable_irq
|
|
msr daifset, #2
|
|
.endm
|
|
|
|
.macro enable_irq
|
|
msr daifclr, #2
|
|
.endm
|
|
|
|
/*
|
|
* Enable and disable debug exceptions.
|
|
*/
|
|
.macro disable_dbg
|
|
msr daifset, #8
|
|
.endm
|
|
|
|
.macro enable_dbg
|
|
msr daifclr, #8
|
|
.endm
|
|
|
|
.macro disable_step_tsk, flgs, tmp
|
|
tbz \flgs, #TIF_SINGLESTEP, 9990f
|
|
mrs \tmp, mdscr_el1
|
|
bic \tmp, \tmp, #1
|
|
msr mdscr_el1, \tmp
|
|
isb // Synchronise with enable_dbg
|
|
9990:
|
|
.endm
|
|
|
|
.macro enable_step_tsk, flgs, tmp
|
|
tbz \flgs, #TIF_SINGLESTEP, 9990f
|
|
disable_dbg
|
|
mrs \tmp, mdscr_el1
|
|
orr \tmp, \tmp, #1
|
|
msr mdscr_el1, \tmp
|
|
9990:
|
|
.endm
|
|
|
|
/*
|
|
* Enable both debug exceptions and interrupts. This is likely to be
|
|
* faster than two daifclr operations, since writes to this register
|
|
* are self-synchronising.
|
|
*/
|
|
.macro enable_dbg_and_irq
|
|
msr daifclr, #(8 | 2)
|
|
.endm
|
|
|
|
/*
|
|
* SMP data memory barrier
|
|
*/
|
|
.macro smp_dmb, opt
|
|
dmb \opt
|
|
.endm
|
|
|
|
/*
|
|
* Emit an entry into the exception table
|
|
*/
|
|
.macro _asm_extable, from, to
|
|
.pushsection __ex_table, "a"
|
|
.align 3
|
|
.long (\from - .), (\to - .)
|
|
.popsection
|
|
.endm
|
|
|
|
#define USER(l, x...) \
|
|
9999: x; \
|
|
_asm_extable 9999b, l
|
|
|
|
/*
|
|
* Register aliases.
|
|
*/
|
|
lr .req x30 // link register
|
|
|
|
/*
|
|
* Vector entry
|
|
*/
|
|
.macro ventry label
|
|
.align 7
|
|
b \label
|
|
.endm
|
|
|
|
/*
|
|
* Select code when configured for BE.
|
|
*/
|
|
#ifdef CONFIG_CPU_BIG_ENDIAN
|
|
#define CPU_BE(code...) code
|
|
#else
|
|
#define CPU_BE(code...)
|
|
#endif
|
|
|
|
/*
|
|
* Select code when configured for LE.
|
|
*/
|
|
#ifdef CONFIG_CPU_BIG_ENDIAN
|
|
#define CPU_LE(code...)
|
|
#else
|
|
#define CPU_LE(code...) code
|
|
#endif
|
|
|
|
/*
|
|
* Define a macro that constructs a 64-bit value by concatenating two
|
|
* 32-bit registers. Note that on big endian systems the order of the
|
|
* registers is swapped.
|
|
*/
|
|
#ifndef CONFIG_CPU_BIG_ENDIAN
|
|
.macro regs_to_64, rd, lbits, hbits
|
|
#else
|
|
.macro regs_to_64, rd, hbits, lbits
|
|
#endif
|
|
orr \rd, \lbits, \hbits, lsl #32
|
|
.endm
|
|
|
|
/*
|
|
* Pseudo-ops for PC-relative adr/ldr/str <reg>, <symbol> where
|
|
* <symbol> is within the range +/- 4 GB of the PC.
|
|
*/
|
|
/*
|
|
* @dst: destination register (64 bit wide)
|
|
* @sym: name of the symbol
|
|
* @tmp: optional scratch register to be used if <dst> == sp, which
|
|
* is not allowed in an adrp instruction
|
|
*/
|
|
.macro adr_l, dst, sym, tmp=
|
|
.ifb \tmp
|
|
adrp \dst, \sym
|
|
add \dst, \dst, :lo12:\sym
|
|
.else
|
|
adrp \tmp, \sym
|
|
add \dst, \tmp, :lo12:\sym
|
|
.endif
|
|
.endm
|
|
|
|
/*
|
|
* @dst: destination register (32 or 64 bit wide)
|
|
* @sym: name of the symbol
|
|
* @tmp: optional 64-bit scratch register to be used if <dst> is a
|
|
* 32-bit wide register, in which case it cannot be used to hold
|
|
* the address
|
|
*/
|
|
.macro ldr_l, dst, sym, tmp=
|
|
.ifb \tmp
|
|
adrp \dst, \sym
|
|
ldr \dst, [\dst, :lo12:\sym]
|
|
.else
|
|
adrp \tmp, \sym
|
|
ldr \dst, [\tmp, :lo12:\sym]
|
|
.endif
|
|
.endm
|
|
|
|
/*
|
|
* @src: source register (32 or 64 bit wide)
|
|
* @sym: name of the symbol
|
|
* @tmp: mandatory 64-bit scratch register to calculate the address
|
|
* while <src> needs to be preserved.
|
|
*/
|
|
.macro str_l, src, sym, tmp
|
|
adrp \tmp, \sym
|
|
str \src, [\tmp, :lo12:\sym]
|
|
.endm
|
|
|
|
/*
|
|
* @sym: The name of the per-cpu variable
|
|
* @reg: Result of per_cpu(sym, smp_processor_id())
|
|
* @tmp: scratch register
|
|
*/
|
|
.macro this_cpu_ptr, sym, reg, tmp
|
|
adr_l \reg, \sym
|
|
mrs \tmp, tpidr_el1
|
|
add \reg, \reg, \tmp
|
|
.endm
|
|
|
|
/*
|
|
* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
|
|
*/
|
|
.macro vma_vm_mm, rd, rn
|
|
ldr \rd, [\rn, #VMA_VM_MM]
|
|
.endm
|
|
|
|
/*
|
|
* mmid - get context id from mm pointer (mm->context.id)
|
|
*/
|
|
.macro mmid, rd, rn
|
|
ldr \rd, [\rn, #MM_CONTEXT_ID]
|
|
.endm
|
|
|
|
/*
|
|
* dcache_line_size - get the minimum D-cache line size from the CTR register.
|
|
*/
|
|
.macro dcache_line_size, reg, tmp
|
|
mrs \tmp, ctr_el0 // read CTR
|
|
ubfm \tmp, \tmp, #16, #19 // cache line size encoding
|
|
mov \reg, #4 // bytes per word
|
|
lsl \reg, \reg, \tmp // actual cache line size
|
|
.endm
|
|
|
|
/*
|
|
* icache_line_size - get the minimum I-cache line size from the CTR register.
|
|
*/
|
|
.macro icache_line_size, reg, tmp
|
|
mrs \tmp, ctr_el0 // read CTR
|
|
and \tmp, \tmp, #0xf // cache line size encoding
|
|
mov \reg, #4 // bytes per word
|
|
lsl \reg, \reg, \tmp // actual cache line size
|
|
.endm
|
|
|
|
/*
|
|
* tcr_set_idmap_t0sz - update TCR.T0SZ so that we can load the ID map
|
|
*/
|
|
.macro tcr_set_idmap_t0sz, valreg, tmpreg
|
|
#ifndef CONFIG_ARM64_VA_BITS_48
|
|
ldr_l \tmpreg, idmap_t0sz
|
|
bfi \valreg, \tmpreg, #TCR_T0SZ_OFFSET, #TCR_TxSZ_WIDTH
|
|
#endif
|
|
.endm
|
|
|
|
/*
|
|
* Macro to perform a data cache maintenance for the interval
|
|
* [kaddr, kaddr + size)
|
|
*
|
|
* op: operation passed to dc instruction
|
|
* domain: domain used in dsb instruciton
|
|
* kaddr: starting virtual address of the region
|
|
* size: size of the region
|
|
* Corrupts: kaddr, size, tmp1, tmp2
|
|
*/
|
|
.macro dcache_by_line_op op, domain, kaddr, size, tmp1, tmp2
|
|
dcache_line_size \tmp1, \tmp2
|
|
add \size, \kaddr, \size
|
|
sub \tmp2, \tmp1, #1
|
|
bic \kaddr, \kaddr, \tmp2
|
|
9998: dc \op, \kaddr
|
|
add \kaddr, \kaddr, \tmp1
|
|
cmp \kaddr, \size
|
|
b.lo 9998b
|
|
dsb \domain
|
|
.endm
|
|
|
|
/*
|
|
* reset_pmuserenr_el0 - reset PMUSERENR_EL0 if PMUv3 present
|
|
*/
|
|
.macro reset_pmuserenr_el0, tmpreg
|
|
mrs \tmpreg, id_aa64dfr0_el1 // Check ID_AA64DFR0_EL1 PMUVer
|
|
sbfx \tmpreg, \tmpreg, #8, #4
|
|
cmp \tmpreg, #1 // Skip if no PMU present
|
|
b.lt 9000f
|
|
msr pmuserenr_el0, xzr // Disable PMU access from EL0
|
|
9000:
|
|
.endm
|
|
|
|
/*
|
|
* copy_page - copy src to dest using temp registers t1-t8
|
|
*/
|
|
.macro copy_page dest:req src:req t1:req t2:req t3:req t4:req t5:req t6:req t7:req t8:req
|
|
9998: ldp \t1, \t2, [\src]
|
|
ldp \t3, \t4, [\src, #16]
|
|
ldp \t5, \t6, [\src, #32]
|
|
ldp \t7, \t8, [\src, #48]
|
|
add \src, \src, #64
|
|
stnp \t1, \t2, [\dest]
|
|
stnp \t3, \t4, [\dest, #16]
|
|
stnp \t5, \t6, [\dest, #32]
|
|
stnp \t7, \t8, [\dest, #48]
|
|
add \dest, \dest, #64
|
|
tst \src, #(PAGE_SIZE - 1)
|
|
b.ne 9998b
|
|
.endm
|
|
|
|
/*
|
|
* Annotate a function as position independent, i.e., safe to be called before
|
|
* the kernel virtual mapping is activated.
|
|
*/
|
|
#define ENDPIPROC(x) \
|
|
.globl __pi_##x; \
|
|
.type __pi_##x, %function; \
|
|
.set __pi_##x, x; \
|
|
.size __pi_##x, . - x; \
|
|
ENDPROC(x)
|
|
|
|
/*
|
|
* Emit a 64-bit absolute little endian symbol reference in a way that
|
|
* ensures that it will be resolved at build time, even when building a
|
|
* PIE binary. This requires cooperation from the linker script, which
|
|
* must emit the lo32/hi32 halves individually.
|
|
*/
|
|
.macro le64sym, sym
|
|
.long \sym\()_lo32
|
|
.long \sym\()_hi32
|
|
.endm
|
|
|
|
/*
|
|
* mov_q - move an immediate constant into a 64-bit register using
|
|
* between 2 and 4 movz/movk instructions (depending on the
|
|
* magnitude and sign of the operand)
|
|
*/
|
|
.macro mov_q, reg, val
|
|
.if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff)
|
|
movz \reg, :abs_g1_s:\val
|
|
.else
|
|
.if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff)
|
|
movz \reg, :abs_g2_s:\val
|
|
.else
|
|
movz \reg, :abs_g3:\val
|
|
movk \reg, :abs_g2_nc:\val
|
|
.endif
|
|
movk \reg, :abs_g1_nc:\val
|
|
.endif
|
|
movk \reg, :abs_g0_nc:\val
|
|
.endm
|
|
|
|
#endif /* __ASM_ASSEMBLER_H */
|