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Commit d18d6d65 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: early_ioremap(), debugging 



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

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent bd796ed0

arch/x86/mm/ioremap_32.c

+29 −0
Original line number Diff line number Diff line
@@ -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);