diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-01-11 15:34:05 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-01-11 15:34:05 +0100 |
commit | d19b85db9d5c44a4c21dcb10d6fbadaa4425ab2a (patch) | |
tree | 250be7a5a29069f7d1f4524fa45ab0e988833025 /arch/blackfin/mach-bf561/include/mach/mem_map.h | |
parent | 490dea45d00f01847ebebd007685d564aaf2cd98 (diff) | |
parent | c59765042f53a79a7a65585042ff463b69cb248c (diff) |
Merge commit 'v2.6.29-rc1' into timers/urgent
Diffstat (limited to 'arch/blackfin/mach-bf561/include/mach/mem_map.h')
-rw-r--r-- | arch/blackfin/mach-bf561/include/mach/mem_map.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf561/include/mach/mem_map.h b/arch/blackfin/mach-bf561/include/mach/mem_map.h index f1d4c0637bd..419dffdc96e 100644 --- a/arch/blackfin/mach-bf561/include/mach/mem_map.h +++ b/arch/blackfin/mach-bf561/include/mach/mem_map.h @@ -85,4 +85,84 @@ #define L1_SCRATCH_START COREA_L1_SCRATCH_START #define L1_SCRATCH_LENGTH 0x1000 +#ifdef __ASSEMBLY__ + +/* + * The following macros both return the address of the PDA for the + * current core. + * + * In its first safe (and hairy) form, the macro neither clobbers any + * register aside of the output Preg, nor uses the stack, since it + * could be called with an invalid stack pointer, or the current stack + * space being uncovered by any CPLB (e.g. early exception handling). + * + * The constraints on the second form are a bit relaxed, and the code + * is allowed to use the specified Dreg for determining the PDA + * address to be returned into Preg. + */ +#ifdef CONFIG_SMP +#define GET_PDA_SAFE(preg) \ + preg.l = lo(DSPID); \ + preg.h = hi(DSPID); \ + preg = [preg]; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + preg = preg << 2; \ + if cc jump 2f; \ + cc = preg == 0x0; \ + preg.l = _cpu_pda; \ + preg.h = _cpu_pda; \ + if !cc jump 3f; \ +1: \ + /* preg = 0x0; */ \ + cc = !cc; /* restore cc to 0 */ \ + jump 4f; \ +2: \ + cc = preg == 0x0; \ + preg.l = _cpu_pda; \ + preg.h = _cpu_pda; \ + if cc jump 4f; \ + /* preg = 0x1000000; */ \ + cc = !cc; /* restore cc to 1 */ \ +3: \ + preg = [preg]; \ +4: + +#define GET_PDA(preg, dreg) \ + preg.l = lo(DSPID); \ + preg.h = hi(DSPID); \ + dreg = [preg]; \ + preg.l = _cpu_pda; \ + preg.h = _cpu_pda; \ + cc = bittst(dreg, 0); \ + if !cc jump 1f; \ + preg = [preg]; \ +1: \ + +#define GET_CPUID(preg, dreg) \ + preg.l = lo(DSPID); \ + preg.h = hi(DSPID); \ + dreg = [preg]; \ + dreg = ROT dreg BY -1; \ + dreg = CC; + +#else +#define GET_PDA_SAFE(preg) \ + preg.l = _cpu_pda; \ + preg.h = _cpu_pda; + +#define GET_PDA(preg, dreg) GET_PDA_SAFE(preg) +#endif /* CONFIG_SMP */ + +#endif /* __ASSEMBLY__ */ + #endif /* _MEM_MAP_533_H_ */ |