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| author | Linus Walleij <triad@df.lth.se> | 2007-01-21 20:08:33 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-01-24 11:59:57 +0000 |
| commit | d4e1c889c1ec547371227558e1da5f2f50c7dd5e (patch) | |
| tree | 82d2d852537712c56161ffabc262e38ea34beaf2 /arch | |
| parent | d28122a5877cc40350fa801353fd5a9350563ec3 (diff) | |
| download | linux-d4e1c889c1ec547371227558e1da5f2f50c7dd5e.tar.gz | |
[ARM] 4102/1: Allow for PHYS_OFFSET on any valid 2MiB address
This patchs allows the offset to the first page of physical memory to be on any 2MB boundary whereas the previous code could only handle psysical offset to any 16MB boundary (0xNN000000) or any 1MB boundary below 0x01000000 (e.g. 0x00N00000). The problem is a consequence of the orr one-byte syntax, so we fix this and we can place the first bank of memory at 0x28e00000. I have also included an explicit check that disallow compilation when PHYS_OFFSET is not on a 2MiB boundary. head.S would be the proper place to have this at since this is the first file that attempts to use PHYS_OFFSET during compile. Signed-off-by: Linus Walleij <triad@df.lth.se> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/head.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index d994561816a1..cf495a3084b3 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -22,6 +22,10 @@ #include <asm/thread_info.h> #include <asm/system.h> +#if (PHYS_OFFSET & 0x001fffff) +#error "PHYS_OFFSET must be at an even 2MiB boundary!" +#endif + #define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET) #define KERNEL_RAM_PADDR (PHYS_OFFSET + TEXT_OFFSET) @@ -251,7 +255,8 @@ __create_page_tables: * Then map first 1MB of ram in case it contains our boot params. */ add r0, r4, #PAGE_OFFSET >> 18 - orr r6, r7, #PHYS_OFFSET + orr r6, r7, #(PHYS_OFFSET & 0xff000000) + orr r6, r6, #(PHYS_OFFSET & 0x00e00000) str r6, [r0] #ifdef CONFIG_XIP_KERNEL |