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| author |   Russell King <rmk+kernel@arm.linux.org.uk> | 2016-02-16 17:33:56 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2016-02-17 00:28:39 +0000 |
| commit | 8ff97fa31333e8d0f4f7029798d9c7d59359b05c (patch) | |
| tree | 23903431f74033ab44908b48b16fb2380478aa10 /arch/arm/include/asm/memory.h | |
| parent | ARM: 8512/1: proc-v7.S: Adjust stack address when XIP_KERNEL (diff) | |
| download | linux-dev-8ff97fa31333e8d0f4f7029798d9c7d59359b05c.tar.xz linux-dev-8ff97fa31333e8d0f4f7029798d9c7d59359b05c.zip | |
ARM: make the physical-relative calculation more obvious
The physical-relative calculation between the XIP text and data sections
introduced by the previous patch was far from obvious. Let's simplify it
by turning it into a macro which takes the two (virtual) addresses.
This allows us to arrange the calculation in a more obvious manner - we
can make it two sub-expressions which calculate the physical address for
each symbol, and then takes the difference of those physical addresses.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/memory.h')
| -rw-r--r-- | arch/arm/include/asm/memory.h | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index ebdaaf7dd19f..51fc9b3b52ea 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -135,11 +135,18 @@ #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) #ifdef CONFIG_XIP_KERNEL -#define PHYS_OFFSET_FIXUP \ - ( XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) - PAGE_OFFSET + \ - PLAT_PHYS_OFFSET - CONFIG_XIP_PHYS_ADDR ) +/* + * When referencing data in RAM from the XIP region in a relative manner + * with the MMU off, we need the relative offset between the two physical + * addresses. The macro below achieves this, which is: + * __pa(v_data) - __xip_pa(v_text) + */ +#define PHYS_RELATIVE(v_data, v_text) \ + (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \ + ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \ + CONFIG_XIP_PHYS_ADDR)) #else -#define PHYS_OFFSET_FIXUP 0 +#define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text)) #endif #ifndef __ASSEMBLY__ |