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[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>
This commit is contained in:
Linus Walleij 2007-01-21 20:08:33 +01:00 committed by Russell King
parent d28122a587
commit d4e1c889c1
1 changed files with 6 additions and 1 deletions
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7
arch/arm/kernel/head.S
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@ -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