proc-arm925.s

linux-2.4.29操作系统的源码

 * the i-cache but to make sure that any data written to the
 * range is made consistant.  This means that when we execute code
 * in that region, everything works as we expect.
 *
 * This generally means writing back data in the Dcache and
 * write buffer and flushing the Icache over that region
 *
 * start: virtual start address
 * end:   virtual end address
 *
 * NOTE: ICACHELINESIZE == DCACHELINESIZE (so we don't need to
 * loop twice, once for i-cache, once for d-cache)
 */
	.align	5
ENTRY(cpu_arm925_icache_invalidate_range)
	bic	r0, r0, #ICACHELINESIZE - 1	@ Safety check
	sub	r1, r1, r0
	cmp	r1, #MAX_AREA_SIZE
	bgt	cpu_arm925_cache_clean_invalidate_all_r2

	bic	r1, r1, #ICACHELINESIZE - 1
	add	r1, r1, #ICACHELINESIZE

1:	mcr	p15, 0, r0, c7, c5, 1		@ Clean I entry
	mcr	p15, 0, r0, c7, c10, 1		@ Clean D entry
	add	r0, r0, #ICACHELINESIZE
	subs	r1, r1, #ICACHELINESIZE
	bne	1b

	mov	r0, #0
	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
	mov	pc, lr


ENTRY(cpu_arm925_icache_invalidate_page)
	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
        nop
        nop
        nop
        nop
	mov	pc, lr

/* ================================== TLB ================================= */

/*
 * cpu_arm925_tlb_invalidate_all()
 *
 * Invalidate all TLB entries
 */
	.align	5
ENTRY(cpu_arm925_tlb_invalidate_all)
	mov	r0, #0
	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
	mcr	p15, 0, r0, c8, c7, 0		@ invalidate I & D TLBs
	mov	pc, lr

/*
 * cpu_arm925_tlb_invalidate_range(start, end)
 *
 * invalidate TLB entries covering the specified range
 *
 * start: range start address
 * end:   range end address
 */
	.align	5
ENTRY(cpu_arm925_tlb_invalidate_range)
	mov	r3, #0
	mcr	p15, 0, r3, c7, c10, 4		@ drain WB

	mov	r3, #PAGESIZE
	sub	r3, r3, #1
	bic 	r0, r0, r3
	bic	r1, r1, r3

1:	mcr	p15, 0, r0, c8, c6, 1		@ invalidate D TLB entry
	mcr	p15, 0, r0, c8, c5, 1		@ invalidate I TLB entry
	add	r0, r0, #PAGESIZE
	cmp	r0, r1
	blt	1b
	mov	pc, lr

/*
 * cpu_arm925_tlb_invalidate_page(page, flags)
 *
 * invalidate the TLB entries for the specified page.
 *
 * page:  page to invalidate
 * flags: non-zero if we include the I TLB
 */
	.align	5
ENTRY(cpu_arm925_tlb_invalidate_page)
	mov	r3, #0
	mcr	p15, 0, r3, c7, c10, 4		@ drain WB
	teq	r1, #0
	mcr	p15, 0, r0, c8, c6, 1		@ invalidate D TLB entry
	mcrne	p15, 0, r0, c8, c5, 1		@ invalidate I TLB entry
	mov	pc, lr

/* =============================== PageTable ============================== */

/*
 * cpu_arm925_set_pgd(pgd)
 *
 * Set the translation base pointer to be as described by pgd.
 *
 * pgd: new page tables
 */
	.align	5
ENTRY(cpu_arm925_set_pgd)
	mov	ip, #0
#ifdef CONFIG_CPU_ARM925_WRITETHROUGH
	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I & D cache
#else
/*
 * 'Clean & Invalidate whole DCache'
 * Re-written to use Index Ops.
 * NOTE: Requires TI925T Configuration Register C bit <- 0
 *       for clean and invalidate of both D-Cache sets.
 */
	mov	r3, #255 << 4		@ 256 entries/set
					@ ((NSETS - 1) << (CIR[13-12] + 3))
2:	mcr	p15, 0, r3, c7, c14, 2	@ clean & invalidate D index
	subs	r3, r3, #1 << 4
	bcs	2b			@ entries 255 to 0
#endif
	mcr	p15, 0, ip, c7, c5, 0		@ invalidate I cache
	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs
	mov	pc, lr

/*
 * cpu_arm925_set_pmd(pmdp, pmd)
 *
 * Set a level 1 translation table entry, and clean it out of
 * any caches such that the MMUs can load it correctly.
 *
 * pmdp: pointer to PMD entry
 * pmd:  PMD value to store
 */
	.align	5
ENTRY(cpu_arm925_set_pmd)
#ifdef CONFIG_CPU_ARM925_WRITETHROUGH
	eor	r2, r1, #0x0a			@ C & Section
	tst	r2, #0x0b
	biceq	r1, r1, #4			@ clear bufferable bit
#endif
	str	r1, [r0]
	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
	mov	pc, lr

/*
 * cpu_arm925_set_pte(ptep, pte)
 *
 * Set a PTE and flush it out
 */
	.align	5
ENTRY(cpu_arm925_set_pte)
	str	r1, [r0], #-1024		@ linux version

	eor	r1, r1, #LPTE_PRESENT | LPTE_YOUNG | LPTE_WRITE | LPTE_DIRTY

	bic	r2, r1, #0xff0
	bic	r2, r2, #3
	orr	r2, r2, #HPTE_TYPE_SMALL

	tst	r1, #LPTE_USER | LPTE_EXEC	@ User or Exec?
	orrne	r2, r2, #HPTE_AP_READ

	tst	r1, #LPTE_WRITE | LPTE_DIRTY	@ Write and Dirty?
	orreq	r2, r2, #HPTE_AP_WRITE

	tst	r1, #LPTE_PRESENT | LPTE_YOUNG	@ Present and Young?
	movne	r2, #0

#ifdef CONFIG_CPU_ARM925_WRITETHROUGH
	eor	r3, r2, #0x0a			@ C & small page?
	tst	r3, #0x0b
	biceq	r2, r2, #4
#endif
	str	r2, [r0]			@ hardware version
	mov	r0, r0
	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
	mov	pc, lr


ENTRY(cpu_arm925_name)
	.ascii	"Arm925T"
#if defined(CONFIG_CPU_ARM925_CPU_IDLE)
	.ascii	"s"
#endif
#if defined(CONFIG_CPU_ARM925_I_CACHE_ON)
	.ascii	"i"
#endif
#if defined(CONFIG_CPU_ARM925_D_CACHE_ON)
	.ascii	"d"
#if defined(CONFIG_CPU_ARM925_WRITETHROUGH)
	.ascii	"(wt)"
#else
	.ascii	"(wb)"
#endif
#endif
	.ascii	"\0"

ENTRY(cpu_arm915_name)
	.ascii	"Arm915T"
#if defined(CONFIG_CPU_ARM925_CPU_IDLE)
	.ascii	"s"
#endif
#if defined(CONFIG_CPU_ARM925_I_CACHE_ON)
	.ascii	"i"
#endif
#if defined(CONFIG_CPU_ARM925_D_CACHE_ON)
	.ascii	"d"
#if defined(CONFIG_CPU_ARM925_WRITETHROUGH)
	.ascii	"(wt)"
#else
	.ascii	"(wb)"
#endif
#endif
	.ascii	"\0"
	.align

	.section ".text.init", #alloc, #execinstr

__arm925_setup:
	mov	r0, #0
#if defined(CONFIG_CPU_ARM925_NON_STREAMING_ON)
        orr     r0,r0,#0x80
#endif
#if defined(CONFIG_CPU_ARM925_TRANSPARENT_ON)
        orr     r0,r0,#0x2
#endif
	mcr	p15, 0, r0, c15, c1, 0		@ write TI config register
	mov	r0, #0
	mcr	p15, 0, r0, c7, c7		@ invalidate I,D caches on v4
	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer on v4
	mcr	p15, 0, r0, c8, c7		@ invalidate I,D TLBs on v4
	mcr	p15, 0, r4, c2, c0		@ load page table pointer
	mov	r0, #0x1f			@ Domains 0, 1 = client
	mcr	p15, 0, r0, c3, c0		@ load domain access register
	mrc	p15, 0, r0, c1, c0		@ get control register v4
/*
 * Clear out 'unwanted' bits (then put them in if we need them)
 */
						@   VI ZFRS BLDP WCAM
	bic	r0, r0, #0x0e00
	bic	r0, r0, #0x0002
	bic	r0, r0, #0x000c
	bic	r0, r0, #0x1000			@ ...0 000. .... 000.
/*
 * Turn on what we want
 */
	orr	r0, r0, #0x0031
	orr	r0, r0, #0x2100			@ ..1. ...1 ..11 ...1

#ifdef CONFIG_CPU_ARM925_WRITEBUFFER_ON
	orr	r0, r0, #0x0008			@ .... .... .... 1...
#endif
#ifdef CONFIG_CPU_ARM925_D_CACHE_ON
	orr	r0, r0, #0x0004			@ .... .... .... .1..
#endif
#ifdef CONFIG_CPU_ARM925_I_CACHE_ON
	orr	r0, r0, #0x1000			@ ...1 .... .... ....
#endif
	mov	pc, lr

	.text

/*
 * Purpose : Function pointers used to access above functions - all calls
 *	     come through these
 */
	.type	arm925_processor_functions, #object
arm925_processor_functions:
	.word	cpu_arm925_data_abort
	.word	cpu_arm925_check_bugs
	.word	cpu_arm925_proc_init
	.word	cpu_arm925_proc_fin
	.word	cpu_arm925_reset
	.word   cpu_arm925_do_idle

	/* cache */
	.word	cpu_arm925_cache_clean_invalidate_all
	.word	cpu_arm925_cache_clean_invalidate_range
	.word	cpu_arm925_flush_ram_page

	/* dcache */
	.word	cpu_arm925_dcache_invalidate_range
	.word	cpu_arm925_dcache_clean_range
	.word	cpu_arm925_dcache_clean_page
	.word	cpu_arm925_dcache_clean_entry

	/* icache */
	.word	cpu_arm925_icache_invalidate_range
	.word	cpu_arm925_icache_invalidate_page

	/* tlb */
	.word	cpu_arm925_tlb_invalidate_all
	.word	cpu_arm925_tlb_invalidate_range
	.word	cpu_arm925_tlb_invalidate_page

	/* pgtable */
	.word	cpu_arm925_set_pgd
	.word	cpu_arm925_set_pmd
	.word	cpu_arm925_set_pte
	.size	arm925_processor_functions, . - arm925_processor_functions

	.type	cpu_arm925_info, #object
cpu_arm925_info:
	.long	0
	.long	cpu_arm925_name
	.size	cpu_arm925_info, . - cpu_arm925_info

	.type	cpu_arm915_info, #object
cpu_arm915_info:
	.long	cpu_manu_name
	.long	cpu_arm915_name
	.size	cpu_arm915_info, . - cpu_arm915_info

	.type	cpu_arch_name, #object
cpu_arch_name:
	.asciz	"armv4"
	.size	cpu_arch_name, . - cpu_arch_name

	.type	cpu_elf_name, #object
cpu_elf_name:
	.asciz	"v4"
	.size	cpu_elf_name, . - cpu_elf_name
	.align

#if	defined(CONFIG_CPU_ARM925_WRITETHROUGH)
#  define	MMU_FLAGS	0x00000c1a
#else
#  define	MMU_FLAGS	0x00000c1e
#endif
	.section ".proc.info", #alloc, #execinstr

	.type	__arm925_proc_info,#object
__arm925_proc_info:
	.long	0x54029252
	.long	0xffffffff
	.long	MMU_FLAGS
	b	__arm925_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
	.long	cpu_arm925_info
	.long	arm925_processor_functions
	.size	__arm925_proc_info, . - __arm925_proc_info

	.type	__arm915_proc_info,#object
__arm915_proc_info:
	.long	0x54029152
	.long	0xffffffff
	.long	MMU_FLAGS
	b	__arm925_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
	.long	cpu_arm915_info
	.long	arm925_processor_functions
	.size	__arm925_proc_info, . - __arm925_proc_info