Hexagon: add support for ARCH_PFN_OFFSET
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>
diff --git a/arch/hexagon/mm/init.c b/arch/hexagon/mm/init.c
index 69ffcfd..8e803a6 100644
--- a/arch/hexagon/mm/init.c
+++ b/arch/hexagon/mm/init.c
@@ -31,9 +31,10 @@
* Define a startpg just past the end of the kernel image and a lastpg
* that corresponds to the end of real or simulated platform memory.
*/
-#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET))
+#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
-unsigned long bootmem_lastpg; /* Should be set by platform code */
+unsigned long bootmem_lastpg; /* Should be set by platform code */
+unsigned long __phys_offset; /* physical kernel offset >> 12 */
/* Set as variable to limit PMD copies */
int max_kernel_seg = 0x303;
@@ -44,7 +45,6 @@
/* indicate pfn's of high memory */
unsigned long highstart_pfn, highend_pfn;
-/* struct mmu_gather defined in asm-generic.h; */
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
/* Default cache attribute for newly created page tables */
@@ -71,7 +71,7 @@
{
/* No idea where this is actually declared. Seems to evade LXR. */
totalram_pages += free_all_bootmem();
- num_physpages = bootmem_lastpg; /* seriously, what? */
+ num_physpages = bootmem_lastpg-ARCH_PFN_OFFSET;
printk(KERN_INFO "totalram_pages = %ld\n", totalram_pages);
@@ -193,6 +193,9 @@
* This needs to change for highmem setups.
*/
+ /* Prior to this, bootmem_lastpg is actually mem size */
+ bootmem_lastpg += ARCH_PFN_OFFSET;
+
/* Memory size needs to be a multiple of 16M */
bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
~((BIG_KERNEL_PAGE_SIZE) - 1));
@@ -201,12 +204,15 @@
* Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
* memory allocation
*/
- bootmap_size = init_bootmem(bootmem_startpg, bootmem_lastpg -
- PFN_DOWN(DMA_RESERVED_BYTES));
+
+ max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
+ min_low_pfn = ARCH_PFN_OFFSET;
+ bootmap_size = init_bootmem_node(NODE_DATA(0), bootmem_startpg, min_low_pfn, max_low_pfn);
printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg);
printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg);
printk(KERN_INFO "bootmap_size: %d\n", bootmap_size);
+ printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn);
printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn);
/*
@@ -221,14 +227,17 @@
/* this actually only goes to the end of the first gig */
segtable_end = segtable + (1<<(30-22));
- /* Move forward to the start of empty pages */
- segtable += bootmem_lastpg >> (22-PAGE_SHIFT);
+ /*
+ * Move forward to the start of empty pages; take into account
+ * phys_offset shift.
+ */
+ segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
{
- int i;
+ int i;
- for (i = 1 ; i <= DMA_RESERVE ; i++)
- segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
+ for (i = 1 ; i <= DMA_RESERVE ; i++)
+ segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
| __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X
| __HEXAGON_C_UNC << 6
| __HVM_PDE_S_4MB);
@@ -256,7 +265,7 @@
* Free all the memory that wasn't taken up by the bootmap, the DMA
* reserve, or kernel itself.
*/
- free_bootmem(PFN_PHYS(bootmem_startpg)+bootmap_size,
+ free_bootmem(PFN_PHYS(bootmem_startpg) + bootmap_size,
PFN_PHYS(bootmem_lastpg - bootmem_startpg) - bootmap_size -
DMA_RESERVED_BYTES);