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[ARM] Clean up KERNEL_RAM_ADDR

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Clean up the KERNEL_RAM_ADDR stuff in arch/arm/kernel/head.S to
make it clearer what's referring to what.  In doing so, remove
the usage of __virt_to_phys(), which is not guaranteed to be
something that the assembler can parse.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2006-12-11 22:29:16 +00:00 committed by Russell King
parent bca0b8e75f
commit f06b97ffd1
1 changed files with 10 additions and 9 deletions
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19
arch/arm/kernel/head.S
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@ -22,30 +22,31 @@
#include <asm/thread_info.h>
#include <asm/system.h>
#define KERNEL_RAM_ADDR (PAGE_OFFSET + TEXT_OFFSET)
#define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET)
#define KERNEL_RAM_PADDR (PHYS_OFFSET + TEXT_OFFSET)
/*
* swapper_pg_dir is the virtual address of the initial page table.
* We place the page tables 16K below KERNEL_RAM_ADDR. Therefore, we must
* make sure that KERNEL_RAM_ADDR is correctly set. Currently, we expect
* We place the page tables 16K below KERNEL_RAM_VADDR. Therefore, we must
* make sure that KERNEL_RAM_VADDR is correctly set. Currently, we expect
* the least significant 16 bits to be 0x8000, but we could probably
* relax this restriction to KERNEL_RAM_ADDR >= PAGE_OFFSET + 0x4000.
* relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000.
*/
#if (KERNEL_RAM_ADDR & 0xffff) != 0x8000
#error KERNEL_RAM_ADDR must start at 0xXXXX8000
#if (KERNEL_RAM_VADDR & 0xffff) != 0x8000
#error KERNEL_RAM_VADDR must start at 0xXXXX8000
#endif
.globl swapper_pg_dir
.equ swapper_pg_dir, KERNEL_RAM_ADDR - 0x4000
.equ swapper_pg_dir, KERNEL_RAM_VADDR - 0x4000
.macro pgtbl, rd
ldr \rd, =(__virt_to_phys(KERNEL_RAM_ADDR - 0x4000))
ldr \rd, =(KERNEL_RAM_PADDR - 0x4000)
.endm
#ifdef CONFIG_XIP_KERNEL
#define TEXTADDR XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
#else
#define TEXTADDR KERNEL_RAM_ADDR
#define TEXTADDR KERNEL_RAM_VADDR
#endif
/*