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SubjectRe: [PATCH v3 RESEND 05/17] ARM: LPAE: support 64-bit virt_to_phys patching
On Fri, 21 Sep 2012, Cyril Chemparathy wrote:

> This patch adds support for 64-bit physical addresses in virt_to_phys()
> patching. This does not do real 64-bit add/sub, but instead patches in the
> upper 32-bits of the phys_offset directly into the output of virt_to_phys.
>
> There is no corresponding change on the phys_to_virt() side, because
> computations on the upper 32-bits would be discarded anyway.
>
> Signed-off-by: Cyril Chemparathy <cyril@ti.com>

Reviewed-by: Nicolas Pitre <nico@linaro.org>


> ---
> arch/arm/include/asm/memory.h | 38 ++++++++++++++++++++++++++++++++++++--
> arch/arm/kernel/head.S | 4 ++++
> arch/arm/kernel/setup.c | 2 +-
> 3 files changed, 41 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
> index 88ca206..f3e8f88 100644
> --- a/arch/arm/include/asm/memory.h
> +++ b/arch/arm/include/asm/memory.h
> @@ -154,13 +154,47 @@
> #ifdef CONFIG_ARM_PATCH_PHYS_VIRT
>
> extern unsigned long __pv_offset;
> -extern unsigned long __pv_phys_offset;
> +extern phys_addr_t __pv_phys_offset;
> #define PHYS_OFFSET __virt_to_phys(PAGE_OFFSET)
>
> static inline phys_addr_t __virt_to_phys(unsigned long x)
> {
> - unsigned long t;
> + phys_addr_t t;
> +
> +#ifndef CONFIG_ARM_LPAE
> early_patch_imm8("add", t, x, __pv_offset, 0);
> +#else
> + unsigned long __tmp;
> +
> +#ifndef __ARMEB__
> +#define PV_PHYS_HIGH "(__pv_phys_offset + 4)"
> +#else
> +#define PV_PHYS_HIGH "__pv_phys_offset"
> +#endif
> +
> + early_patch_stub(
> + /* type */ PATCH_IMM8,
> + /* code */
> + "ldr %[tmp], =__pv_offset\n"
> + "ldr %[tmp], [%[tmp]]\n"
> + "add %Q[to], %[from], %[tmp]\n"
> + "ldr %[tmp], =" PV_PHYS_HIGH "\n"
> + "ldr %[tmp], [%[tmp]]\n"
> + "mov %R[to], %[tmp]\n",
> + /* pad */ 4,
> + /* patch_data */
> + ".long __pv_offset\n"
> + "add %Q[to], %[from], %[imm]\n"
> + ".long " PV_PHYS_HIGH "\n"
> + "mov %R[to], %[imm]\n",
> + /* operands */
> + : [to] "=r" (t),
> + [tmp] "=&r" (__tmp)
> + : [from] "r" (x),
> + [imm] "I" (__IMM8),
> + "i" (&__pv_offset),
> + "i" (&__pv_phys_offset));
> +#endif
> return t;
> }
>
> diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
> index 69a3c09..61fb8df 100644
> --- a/arch/arm/kernel/head.S
> +++ b/arch/arm/kernel/head.S
> @@ -530,7 +530,11 @@ ENDPROC(__fixup_pv_offsets)
>
> .align
> 1: .long .
> +#if defined(CONFIG_ARM_LPAE) && defined(__ARMEB__)
> + .long __pv_phys_offset + 4
> +#else
> .long __pv_phys_offset
> +#endif
> .long __pv_offset
> .long PAGE_OFFSET
> #endif
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index 59e0f57..edb4f42 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -159,7 +159,7 @@ DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
> * The initializers here prevent these from landing in the BSS section.
> */
> unsigned long __pv_offset = 0xdeadbeef;
> -unsigned long __pv_phys_offset = 0xdeadbeef;
> +phys_addr_t __pv_phys_offset = 0xdeadbeef;
> EXPORT_SYMBOL(__pv_phys_offset);
>
> #endif
> --
> 1.7.9.5
>


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