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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a9ff696160
Making virt_to_pfn() a static inline taking a strongly typed (const void *) makes the contract of a passing a pointer of that type to the function explicit and exposes any misuse of the macro virt_to_pfn() acting polymorphic and accepting many types such as (void *), (unitptr_t) or (unsigned long) as arguments without warnings. Doing this is a bit intrusive: virt_to_pfn() requires PHYS_PFN_OFFSET and PAGE_SHIFT to be defined, and this is defined in <asm/page.h>, so this must be included *before* <asm/memory.h>. The use of macros were obscuring the unclear inclusion order here, as the macros would eventually be resolved, but a static inline like this cannot be compiled with unresolved macros. The naive solution to include <asm/page.h> at the top of <asm/memory.h> does not work, because <asm/memory.h> sometimes includes <asm/page.h> at the end of itself, which would create a confusing inclusion loop. So instead, take the approach to always unconditionally include <asm/page.h> at the end of <asm/memory.h> arch/arm uses <asm/memory.h> explicitly in a lot of places, however it turns out that if we just unconditionally include <asm/memory.h> into <asm/page.h> and switch all inclusions of <asm/memory.h> to <asm/page.h> instead, we enforce the right order and <asm/memory.h> will always have access to the definitions. Put an inclusion guard in place making it impossible to include <asm/memory.h> explicitly. Link: https://lore.kernel.org/linux-mm/20220701160004.2ffff4e5ab59a55499f4c736@linux-foundation.org/ Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
147 lines
3 KiB
ArmAsm
147 lines
3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0
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*
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* SMP support for R-Mobile / SH-Mobile
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2010 Takashi Yoshii
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*
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* Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <linux/threads.h>
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#include <asm/assembler.h>
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#include <asm/page.h>
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#define SCTLR_MMU 0x01
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#define BOOTROM_ADDRESS 0xE6340000
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#define RWTCSRA_ADDRESS 0xE6020004
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#define RWTCSRA_WOVF 0x10
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/*
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* Reset vector for secondary CPUs.
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* This will be mapped at address 0 by SBAR register.
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* We need _long_ jump to the physical address.
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*/
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.arm
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.align 12
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ENTRY(shmobile_boot_vector)
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ldr r1, 1f
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bx r1
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ENDPROC(shmobile_boot_vector)
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.align 2
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.globl shmobile_boot_fn
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shmobile_boot_fn:
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1: .space 4
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.globl shmobile_boot_size
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shmobile_boot_size:
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.long . - shmobile_boot_vector
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#ifdef CONFIG_ARCH_RCAR_GEN2
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/*
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* Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs.
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* This will be mapped at address 0 by SBAR register.
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*/
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ENTRY(shmobile_boot_vector_gen2)
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mrc p15, 0, r0, c0, c0, 5 @ r0 = MPIDR
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ldr r1, shmobile_boot_cpu_gen2
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cmp r0, r1
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bne shmobile_smp_continue_gen2
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mrc p15, 0, r1, c1, c0, 0 @ r1 = SCTLR
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and r0, r1, #SCTLR_MMU
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cmp r0, #SCTLR_MMU
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beq shmobile_smp_continue_gen2
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ldr r0, rwtcsra
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mov r1, #0
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ldrb r1, [r0]
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and r0, r1, #RWTCSRA_WOVF
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cmp r0, #RWTCSRA_WOVF
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bne shmobile_smp_continue_gen2
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ldr r0, bootrom
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bx r0
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shmobile_smp_continue_gen2:
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ldr r1, shmobile_boot_fn_gen2
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bx r1
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ENDPROC(shmobile_boot_vector_gen2)
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.align 4
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rwtcsra:
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.word RWTCSRA_ADDRESS
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bootrom:
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.word BOOTROM_ADDRESS
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.globl shmobile_boot_cpu_gen2
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shmobile_boot_cpu_gen2:
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.word 0x00000000
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.align 2
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.globl shmobile_boot_fn_gen2
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shmobile_boot_fn_gen2:
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.space 4
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.globl shmobile_boot_size_gen2
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shmobile_boot_size_gen2:
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.long . - shmobile_boot_vector_gen2
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#endif /* CONFIG_ARCH_RCAR_GEN2 */
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/*
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* Per-CPU SMP boot function/argument selection code based on MPIDR
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*/
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ENTRY(shmobile_smp_boot)
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mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR
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and r0, r1, #0xffffff @ MPIDR_HWID_BITMASK
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@ r0 = cpu_logical_map() value
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mov r1, #0 @ r1 = CPU index
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adr r2, 1f
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ldmia r2, {r5, r6, r7}
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add r5, r5, r2 @ array of per-cpu mpidr values
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add r6, r6, r2 @ array of per-cpu functions
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add r7, r7, r2 @ array of per-cpu arguments
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shmobile_smp_boot_find_mpidr:
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ldr r8, [r5, r1, lsl #2]
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cmp r8, r0
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bne shmobile_smp_boot_next
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ldr r9, [r6, r1, lsl #2]
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cmp r9, #0
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bne shmobile_smp_boot_found
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shmobile_smp_boot_next:
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add r1, r1, #1
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cmp r1, #NR_CPUS
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blo shmobile_smp_boot_find_mpidr
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b shmobile_smp_sleep
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shmobile_smp_boot_found:
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ldr r0, [r7, r1, lsl #2]
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ret r9
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ENDPROC(shmobile_smp_boot)
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ENTRY(shmobile_smp_sleep)
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wfi
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b shmobile_smp_boot
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ENDPROC(shmobile_smp_sleep)
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.align 2
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1: .long shmobile_smp_mpidr - .
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.long shmobile_smp_fn - 1b
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.long shmobile_smp_arg - 1b
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.bss
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.globl shmobile_smp_mpidr
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shmobile_smp_mpidr:
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.space NR_CPUS * 4
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.globl shmobile_smp_fn
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shmobile_smp_fn:
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.space NR_CPUS * 4
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.globl shmobile_smp_arg
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shmobile_smp_arg:
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.space NR_CPUS * 4
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