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| author | Bill Gatliff <bgat@billgatliff.com> | 2007-05-31 21:02:22 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-07-12 10:13:33 (GMT) |
| commit | 9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a (patch) | |
| tree | bc8520791f304ce297a52f575930c2797067521c /arch/arm/kernel/head.S | |
| parent | 7d09e85448dfa78e3e58186c934449aaf6d49b50 (diff) | |
| download | linux-fsl-qoriq-9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a.tar.xz | |
[ARM] 4423/1: add ATAGS support
Examines the ATAGS pointer (r2) at boot, and interprets
a nonzero value as a reference to an ATAGS structure. A
suitable ATAGS structure replaces the kernel's command line.
Signed-off-by: Bill Gatliff <bgat@billgatliff.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/head.S')
| -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 41f98b4..7898cbc 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -29,6 +29,10 @@ #define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET) #define KERNEL_RAM_PADDR (PHYS_OFFSET + TEXT_OFFSET) +#define ATAG_CORE 0x54410001 +#define ATAG_CORE_SIZE ((2*4 + 3*4) >> 2) + + /* * swapper_pg_dir is the virtual address of the initial page table. * We place the page tables 16K below KERNEL_RAM_VADDR. Therefore, we must @@ -61,7 +65,7 @@ * * This is normally called from the decompressor code. The requirements * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0, - * r1 = machine nr. + * r1 = machine nr, r2 = atags pointer. * * This code is mostly position independent, so if you link the kernel at * 0xc0008000, you call this at __pa(0xc0008000). @@ -85,6 +89,7 @@ ENTRY(stext) bl __lookup_machine_type @ r5=machinfo movs r8, r5 @ invalid machine (r5=0)? beq __error_a @ yes, error 'a' + bl __vet_atags bl __create_page_tables /* |