diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-05-27 07:44:50 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-05-27 10:32:50 +0400 |
| commit | f637a49e507c88354ab32b5d914e06acfb7ee00d (patch) | |
| tree | 60ec94bc3dcf323028faf8b7fd31e6d4c73f2bb5 /arch/powerpc/include | |
| parent | b16e7766d6436835f473ba823ad04fbdfe5e9cbd (diff) | |
| download | linux-f637a49e507c88354ab32b5d914e06acfb7ee00d.tar.xz | |
powerpc: Minor cleanups of kernel virt address space definitions
Make FIXADDR_TOP a compile time constant and cleanup a
couple of definitions relative to the layout of the kernel
address space on ppc32. We also print out that layout at
boot time for debugging purposes.
This is a pre-requisite for properly fixing non-coherent
DMA allocactions.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/fixmap.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/pgtable-ppc32.h | 22 |
2 files changed, 22 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/fixmap.h b/arch/powerpc/include/asm/fixmap.h index d60fd18f428c..f1f4e23a84e9 100644 --- a/arch/powerpc/include/asm/fixmap.h +++ b/arch/powerpc/include/asm/fixmap.h @@ -14,8 +14,6 @@ #ifndef _ASM_FIXMAP_H #define _ASM_FIXMAP_H -extern unsigned long FIXADDR_TOP; - #ifndef __ASSEMBLY__ #include <linux/kernel.h> #include <asm/page.h> @@ -24,6 +22,8 @@ extern unsigned long FIXADDR_TOP; #include <asm/kmap_types.h> #endif +#define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE)) + /* * Here we define all the compile-time 'special' virtual * addresses. The point is to have a constant address at diff --git a/arch/powerpc/include/asm/pgtable-ppc32.h b/arch/powerpc/include/asm/pgtable-ppc32.h index ba45c997830f..28fe9d4bae35 100644 --- a/arch/powerpc/include/asm/pgtable-ppc32.h +++ b/arch/powerpc/include/asm/pgtable-ppc32.h @@ -10,7 +10,7 @@ extern unsigned long va_to_phys(unsigned long address); extern pte_t *va_to_pte(unsigned long address); -extern unsigned long ioremap_bot, ioremap_base; +extern unsigned long ioremap_bot; #ifdef CONFIG_44x extern int icache_44x_need_flush; @@ -56,8 +56,26 @@ extern int icache_44x_need_flush; printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) /* + * This is the bottom of the PKMAP area with HIGHMEM or an arbitrary + * value (for now) on others, from where we can start layout kernel + * virtual space that goes below PKMAP and FIXMAP + */ +#ifdef CONFIG_HIGHMEM +#define KVIRT_TOP PKMAP_BASE +#else +#define KVIRT_TOP (0xfe000000UL) /* for now, could be FIXMAP_BASE ? */ +#endif + +/* + * ioremap_bot starts at that address. Early ioremaps move down from there, + * until mem_init() at which point this becomes the top of the vmalloc + * and ioremap space + */ +#define IOREMAP_TOP KVIRT_TOP + +/* * Just any arbitrary offset to the start of the vmalloc VM area: the - * current 64MB value just means that there will be a 64MB "hole" after the + * current 16MB value just means that there will be a 64MB "hole" after the * physical memory until the kernel virtual memory starts. That means that * any out-of-bounds memory accesses will hopefully be caught. * The vmalloc() routines leaves a hole of 4kB between each vmalloced |