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Hexagon: add support for ARCH_PFN_OFFSET

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Add support for loading the kernel at a physical offset.  The
offset should still be 4M aligned.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
This commit is contained in:
Richard Kuo
2013-03-22 16:05:40 -05:00
parent e0025a72c3
commit 8f5a0b9dff
8 changed files with 91 additions and 55 deletions
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22
arch/hexagon/kernel/head.S
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@@ -43,14 +43,21 @@ ENTRY(stext)
* Symbol is kernel segment address, but we need
* the logical/physical address.
*/
r24 = asl(r24, #2)
r24 = lsr(r24, #2)
r25 = pc;
r2.h = #0xffc0;
r2.l = #0x0000;
r25 = and(r2,r25); /* R25 holds PHYS_OFFSET now */
r1.h = #HI(PAGE_OFFSET);
r1.l = #LO(PAGE_OFFSET);
r24 = sub(r24,r1); /* swapper_pg_dir - PAGE_OFFSET */
r24 = add(r24,r25); /* + PHYS_OFFSET */
r0 = r24
r0 = r24; /* aka __pa(swapper_pg_dir) */
/*
* Initialize a 16MB PTE to make the virtual and physical
* Initialize page dir to make the virtual and physical
* addresses where the kernel was loaded be identical.
* Done in 4MB chunks.
*/
#define PTE_BITS ( __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X \
| __HEXAGON_C_WB_L2 << 6 \
@@ -143,6 +150,13 @@ __head_s_vaddr_target:
r2 = sub(r2,r0);
call memset;
/* Set PHYS_OFFSET; should still be in R25 */
#ifdef CONFIG_HEXAGON_PHYS_OFFSET
r0.l = #LO(__phys_offset);
r0.h = #HI(__phys_offset);
memw(r0) = r25;
#endif
/* Time to make the doughnuts. */
call start_kernel