diff options
| author | Thiemo Seufer <ths@networkno.de> | 2005-04-25 16:36:23 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2005-10-29 19:31:11 +0100 |
| commit | ba5187dbb4b2eac99d6fa1d6bbece67e0066bf51 (patch) | |
| tree | 9a1fa0b0cb6ff1c64c20569c4e6ecdfd3f865bbc /arch/mips/mm/sc-rm7k.c | |
| parent | 7de8d2328767cf4cb463dd3ca70c44985ac835a8 (diff) | |
Better interface to run uncached cache setup code.
Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/sc-rm7k.c')
| -rw-r--r-- | arch/mips/mm/sc-rm7k.c | 29 |
1 files changed, 8 insertions, 21 deletions
diff --git a/arch/mips/mm/sc-rm7k.c b/arch/mips/mm/sc-rm7k.c index 4e92f931aab..1df5aab82c1 100644 --- a/arch/mips/mm/sc-rm7k.c +++ b/arch/mips/mm/sc-rm7k.c @@ -15,6 +15,7 @@ #include <asm/cacheops.h> #include <asm/mipsregs.h> #include <asm/processor.h> +#include <asm/cacheflush.h> /* for run_uncached() */ /* Primary cache parameters. */ #define sc_lsize 32 @@ -96,25 +97,13 @@ static void rm7k_sc_inv(unsigned long addr, unsigned long size) } /* - * This function is executed in the uncached segment CKSEG1. - * It must not touch the stack, because the stack pointer still points - * into CKSEG0. - * - * Three options: - * - Write it in assembly and guarantee that we don't use the stack. - * - Disable caching for CKSEG0 before calling it. - * - Pray that GCC doesn't randomly start using the stack. - * - * This being Linux, we obviously take the least sane of those options - - * following DaveM's lead in c-r4k.c - * - * It seems we get our kicks from relying on unguaranteed behaviour in GCC + * This function is executed in uncached address space. */ static __init void __rm7k_sc_enable(void) { int i; - set_c0_config(1 << 3); /* CONF_SE */ + set_c0_config(R7K_CONF_SE); write_c0_taglo(0); write_c0_taghi(0); @@ -127,24 +116,22 @@ static __init void __rm7k_sc_enable(void) ".set mips0\n\t" ".set reorder" : - : "r" (KSEG0ADDR(i)), "i" (Index_Store_Tag_SD)); + : "r" (CKSEG0ADDR(i)), "i" (Index_Store_Tag_SD)); } } static __init void rm7k_sc_enable(void) { - void (*func)(void) = (void *) KSEG1ADDR(&__rm7k_sc_enable); - - if (read_c0_config() & 0x08) /* CONF_SE */ + if (read_c0_config() & R7K_CONF_SE) return; printk(KERN_INFO "Enabling secondary cache..."); - func(); + run_uncached(__rm7k_sc_enable); } static void rm7k_sc_disable(void) { - clear_c0_config(1<<3); /* CONF_SE */ + clear_c0_config(R7K_CONF_SE); } struct bcache_ops rm7k_sc_ops = { @@ -164,7 +151,7 @@ void __init rm7k_sc_init(void) printk(KERN_INFO "Secondary cache size %dK, linesize %d bytes.\n", (scache_size >> 10), sc_lsize); - if (!((config >> 3) & 1)) /* CONF_SE */ + if (!(config & R7K_CONF_SE)) rm7k_sc_enable(); /* |