cache.h
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- /* $Id: cache.h,v 1.9 1999/08/14 03:51:58 anton Exp $
- * cache.h: Cache specific code for the Sparc. These include flushing
- * and direct tag/data line access.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- */
- #ifndef _SPARC_CACHE_H
- #define _SPARC_CACHE_H
- #include <asm/asi.h>
- #define L1_CACHE_BYTES 32
- #define L1_CACHE_ALIGN(x) ((((x)+(L1_CACHE_BYTES-1))&~(L1_CACHE_BYTES-1)))
- #define SMP_CACHE_BYTES 32
- #ifdef MODULE
- #define __cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
- #else
- #define __cacheline_aligned
- __attribute__((__aligned__(SMP_CACHE_BYTES),
- __section__(".data.cacheline_aligned")))
- #endif
- /* Direct access to the instruction cache is provided through and
- * alternate address space. The IDC bit must be off in the ICCR on
- * HyperSparcs for these accesses to work. The code below does not do
- * any checking, the caller must do so. These routines are for
- * diagnostics only, but could end up being useful. Use with care.
- * Also, you are asking for trouble if you execute these in one of the
- * three instructions following a %asr/%psr access or modification.
- */
- /* First, cache-tag access. */
- extern __inline__ unsigned int get_icache_tag(int setnum, int tagnum)
- {
- unsigned int vaddr, retval;
- vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
- __asm__ __volatile__("lda [%1] %2, %0nt" :
- "=r" (retval) :
- "r" (vaddr), "i" (ASI_M_TXTC_TAG));
- return retval;
- }
- extern __inline__ void put_icache_tag(int setnum, int tagnum, unsigned int entry)
- {
- unsigned int vaddr;
- vaddr = ((setnum&1) << 12) | ((tagnum&0x7f) << 5);
- __asm__ __volatile__("sta %0, [%1] %2nt" : :
- "r" (entry), "r" (vaddr), "i" (ASI_M_TXTC_TAG) :
- "memory");
- }
- /* Second cache-data access. The data is returned two-32bit quantities
- * at a time.
- */
- extern __inline__ void get_icache_data(int setnum, int tagnum, int subblock,
- unsigned int *data)
- {
- unsigned int value1, value2, vaddr;
- vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
- ((subblock&0x3) << 3);
- __asm__ __volatile__("ldda [%2] %3, %%g2nt"
- "or %%g0, %%g2, %0nt"
- "or %%g0, %%g3, %1nt" :
- "=r" (value1), "=r" (value2) :
- "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
- "g2", "g3");
- data[0] = value1; data[1] = value2;
- }
- extern __inline__ void put_icache_data(int setnum, int tagnum, int subblock,
- unsigned int *data)
- {
- unsigned int value1, value2, vaddr;
- vaddr = ((setnum&0x1) << 12) | ((tagnum&0x7f) << 5) |
- ((subblock&0x3) << 3);
- value1 = data[0]; value2 = data[1];
- __asm__ __volatile__("or %%g0, %0, %%g2nt"
- "or %%g0, %1, %%g3nt"
- "stda %%g2, [%2] %3nt" : :
- "r" (value1), "r" (value2),
- "r" (vaddr), "i" (ASI_M_TXTC_DATA) :
- "g2", "g3", "memory" /* no joke */);
- }
- /* Different types of flushes with the ICACHE. Some of the flushes
- * affect both the ICACHE and the external cache. Others only clear
- * the ICACHE entries on the cpu itself. V8's (most) allow
- * granularity of flushes on the packet (element in line), whole line,
- * and entire cache (ie. all lines) level. The ICACHE only flushes are
- * ROSS HyperSparc specific and are in ross.h
- */
- /* Flushes which clear out both the on-chip and external caches */
- extern __inline__ void flush_ei_page(unsigned int addr)
- {
- __asm__ __volatile__("sta %%g0, [%0] %1nt" : :
- "r" (addr), "i" (ASI_M_FLUSH_PAGE) :
- "memory");
- }
- extern __inline__ void flush_ei_seg(unsigned int addr)
- {
- __asm__ __volatile__("sta %%g0, [%0] %1nt" : :
- "r" (addr), "i" (ASI_M_FLUSH_SEG) :
- "memory");
- }
- extern __inline__ void flush_ei_region(unsigned int addr)
- {
- __asm__ __volatile__("sta %%g0, [%0] %1nt" : :
- "r" (addr), "i" (ASI_M_FLUSH_REGION) :
- "memory");
- }
- extern __inline__ void flush_ei_ctx(unsigned int addr)
- {
- __asm__ __volatile__("sta %%g0, [%0] %1nt" : :
- "r" (addr), "i" (ASI_M_FLUSH_CTX) :
- "memory");
- }
- extern __inline__ void flush_ei_user(unsigned int addr)
- {
- __asm__ __volatile__("sta %%g0, [%0] %1nt" : :
- "r" (addr), "i" (ASI_M_FLUSH_USER) :
- "memory");
- }
- #endif /* !(_SPARC_CACHE_H) */