cache.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 142 行

#ifndef __ASM_SH64_CACHE_H
#define __ASM_SH64_CACHE_H

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * include/asm-sh64/cache.h
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003, 2004  Paul Mundt
 *
 */
#include <asm/cacheflush.h>

#define L1_CACHE_SHIFT		5
/* bytes per L1 cache line */
#define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)
#define L1_CACHE_ALIGN_MASK	(~(L1_CACHE_BYTES - 1))
#define L1_CACHE_ALIGN(x)	(((x)+(L1_CACHE_BYTES - 1)) & L1_CACHE_ALIGN_MASK)
#define L1_CACHE_SIZE_BYTES	(L1_CACHE_BYTES << 10)
/* Largest L1 which this arch supports */
#define L1_CACHE_SHIFT_MAX	5

#ifdef MODULE
#define __cacheline_aligned __attribute__((__aligned__(L1_CACHE_BYTES)))
#else
#define __cacheline_aligned					\
  __attribute__((__aligned__(L1_CACHE_BYTES),			\
		 __section__(".data.cacheline_aligned")))
#endif

/*
 * Control Registers.
 */
#define ICCR_BASE	0x01600000	/* Instruction Cache Control Register */
#define ICCR_REG0	0		/* Register 0 offset */
#define ICCR_REG1	1		/* Register 1 offset */
#define ICCR0		ICCR_BASE+ICCR_REG0
#define ICCR1		ICCR_BASE+ICCR_REG1

#define ICCR0_OFF	0x0		/* Set ICACHE off */
#define ICCR0_ON	0x1		/* Set ICACHE on */
#define ICCR0_ICI	0x2		/* Invalidate all in IC */

#define ICCR1_NOLOCK	0x0		/* Set No Locking */

#define OCCR_BASE	0x01E00000	/* Operand Cache Control Register */
#define OCCR_REG0	0		/* Register 0 offset */
#define OCCR_REG1	1		/* Register 1 offset */
#define OCCR0		OCCR_BASE+OCCR_REG0
#define OCCR1		OCCR_BASE+OCCR_REG1

#define OCCR0_OFF	0x0		/* Set OCACHE off */
#define OCCR0_ON	0x1		/* Set OCACHE on */
#define OCCR0_OCI	0x2		/* Invalidate all in OC */
#define OCCR0_WT	0x4		/* Set OCACHE in WT Mode */
#define OCCR0_WB	0x0		/* Set OCACHE in WB Mode */

#define OCCR1_NOLOCK	0x0		/* Set No Locking */


/*
 * SH-5
 * A bit of description here, for neff=32.
 *
 *                               |<--- tag  (19 bits) --->|
 * +-----------------------------+-----------------+------+----------+------+
 * |                             |                 | ways |set index |offset|
 * +-----------------------------+-----------------+------+----------+------+
 *                                ^                 2 bits   8 bits   5 bits
 *                                +- Bit 31
 *
 * Cacheline size is based on offset: 5 bits = 32 bytes per line
 * A cache line is identified by a tag + set but OCACHETAG/ICACHETAG
 * have a broader space for registers. These are outlined by
 * CACHE_?C_*_STEP below.
 *
 */

/* Valid and Dirty bits */
#define SH_CACHE_VALID		(1LL<<0)
#define SH_CACHE_UPDATED	(1LL<<57)

/* Cache flags */
#define SH_CACHE_MODE_WT	(1LL<<0)
#define SH_CACHE_MODE_WB	(1LL<<1)

#ifndef __ASSEMBLY__

/*
 * Cache information structure.
 *
 * Defined for both I and D cache, per-processor.
 */
struct cache_info {
	unsigned int ways;
	unsigned int sets;
	unsigned int linesz;

	unsigned int way_shift;
	unsigned int entry_shift;
	unsigned int set_shift;
	unsigned int way_step_shift;
	unsigned int asid_shift;

	unsigned int way_ofs;

	unsigned int asid_mask;
	unsigned int idx_mask;
	unsigned int epn_mask;

	unsigned long flags;
};

#endif /* __ASSEMBLY__ */

/* Instruction cache */
#define CACHE_IC_ADDRESS_ARRAY 0x01000000

/* Operand Cache */
#define CACHE_OC_ADDRESS_ARRAY 0x01800000

/* These declarations relate to cache 'synonyms' in the operand cache.  A
   'synonym' occurs where effective address bits overlap between those used for
   indexing the cache sets and those passed to the MMU for translation.  In the
   case of SH5-101 & SH5-103, only bit 12 is affected for 4k pages. */

#define CACHE_OC_N_SYNBITS  1               /* Number of synonym bits */
#define CACHE_OC_SYN_SHIFT  12
/* Mask to select synonym bit(s) */
#define CACHE_OC_SYN_MASK   (((1UL<<CACHE_OC_N_SYNBITS)-1)<<CACHE_OC_SYN_SHIFT)


/*
 * Instruction cache can't be invalidated based on physical addresses.
 * No Instruction Cache defines required, then.
 */

#endif /* __ASM_SH64_CACHE_H */