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x86: clean up max_pfn_mapped usage - 32-bit 

on 32-bit in head_32.S after initial page table is done, we get initial
max_pfn_mapped, and then kernel_physical_mapping_init will give us
a final one.

We need to use that to make sure find_e820_area will get valid addresses
for boot_map and for NODE_DATA(0) on numa32.

XEN PV and lguest may need to assign max_pfn_mapped too.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-06-01 23:53:50 -07:00 committed by Ingo Molnar
parent 287572cb38
commit 6af61a7614
3 changed files with 9 additions and 2 deletions
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4
arch/x86/kernel/head_32.S
View File

@ -220,6 +220,8 @@ default_entry:
jb 10b
1:
movl %edi,pa(init_pg_tables_end)
shrl $12, %eax
movl %eax, pa(max_pfn_mapped)
/* Do early initialization of the fixmap area */
movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax
@ -251,6 +253,8 @@ page_pde_offset = (__PAGE_OFFSET >> 20);
cmpl %ebp,%eax
jb 10b
movl %edi,pa(init_pg_tables_end)
shrl $12, %eax
movl %eax, pa(max_pfn_mapped)
/* Do early initialization of the fixmap area */
movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax

4
arch/x86/kernel/setup_32.c
View File

@ -586,7 +586,7 @@ void __init setup_bootmem_allocator(void)
*/
bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT;
bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT,
max_low_pfn<<PAGE_SHIFT, bootmap_size,
max_pfn_mapped<<PAGE_SHIFT, bootmap_size,
PAGE_SIZE);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n", bootmap_size);
@ -595,6 +595,8 @@ void __init setup_bootmem_allocator(void)
reserve_initrd();
#endif
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, max_low_pfn);
printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
max_pfn_mapped<<PAGE_SHIFT);
printk(KERN_INFO " low ram: %08lx - %08lx\n",
min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
printk(KERN_INFO " bootmap %08lx - %08lx\n",

3
arch/x86/mm/discontig_32.c
View File

@ -163,7 +163,8 @@ static void __init allocate_pgdat(int nid)
else {
unsigned long pgdat_phys;
pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
max_low_pfn<<PAGE_SHIFT, sizeof(pg_data_t),
(nid ? max_low_pfn:max_pfn_mapped)<<PAGE_SHIFT,
sizeof(pg_data_t),
PAGE_SIZE);
NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t),