Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-29 11:23:16 +00:00
Code Issues Packages Projects Releases Wiki Activity

x86: early_ioremap(), debugging

Browse Source 
add early_ioremap() debug printouts via the early_ioremap_debug
boot option.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-01-30 13:33:45 +01:00
parent bd796ed023
commit d18d6d65ef
1 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
arch/x86/mm/ioremap_32.c
View File

@ -208,6 +208,17 @@ void iounmap(volatile void __iomem *addr)
}
EXPORT_SYMBOL(iounmap);
int __initdata early_ioremap_debug;
static int __init early_ioremap_debug_setup(char *str)
{
early_ioremap_debug = 1;
return 1;
}
__setup("early_ioremap_debug", early_ioremap_debug_setup);
static __initdata int after_paging_init;
static __initdata unsigned long bm_pte[1024]
__attribute__((aligned(PAGE_SIZE)));
@ -226,6 +237,9 @@ void __init early_ioremap_init(void)
{
unsigned long *pgd;
if (early_ioremap_debug)
printk("early_ioremap_init()\n");
pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
*pgd = __pa(bm_pte) | _PAGE_TABLE;
memset(bm_pte, 0, sizeof(bm_pte));
@ -236,6 +250,9 @@ void __init early_ioremap_clear(void)
{
unsigned long *pgd;
if (early_ioremap_debug)
printk("early_ioremap_clear()\n");
pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
*pgd = 0;
__flush_tlb_all();
@ -303,6 +320,11 @@ void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
WARN_ON(system_state != SYSTEM_BOOTING);
nesting = early_ioremap_nested;
if (early_ioremap_debug) {
printk("early_ioremap(%08lx, %08lx) [%d] => ",
phys_addr, size, nesting);
dump_stack();
}
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
@ -343,6 +365,8 @@ void __init *early_ioremap(unsigned long phys_addr, unsigned long size)
--idx;
--nrpages;
}
if (early_ioremap_debug)
printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0));
return (void*) (offset + fix_to_virt(idx0));
}
@ -358,6 +382,11 @@ void __init early_iounmap(void *addr, unsigned long size)
nesting = --early_ioremap_nested;
WARN_ON(nesting < 0);
if (early_ioremap_debug) {
printk("early_iounmap(%p, %08lx) [%d]\n", addr, size, nesting);
dump_stack();
}
virt_addr = (unsigned long)addr;
if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) {
WARN_ON(1);