proc-arm922.s

嵌入式系统设计与实验教材二源码linux内核移植与编译

ENTRY(cpu_arm922_dcache_clean_entry)
#ifndef CONFIG_CPU_ARM922_WRITETHROUGH
	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
#endif
	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
	mov	pc, lr

/* ================================ I-CACHE =============================== */

/*
 * cpu_arm922_icache_invalidate_range(start, end)
 *
 * invalidate a range of virtual addresses from the Icache
 *
 * This is a little misleading, it is not intended to clean out
 * 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_arm922_icache_invalidate_range)
	bic	r0, r0, #ICACHELINESIZE - 1	@ Safety check
	sub	r1, r1, r0
	cmp	r1, #MAX_AREA_SIZE
	bgt	cpu_arm922_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_arm922_icache_invalidate_page)
	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
	mov	pc, lr

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

/*
 * cpu_arm922_tlb_invalidate_all()
 *
 * Invalidate all TLB entries
 */
	.align	5
ENTRY(cpu_arm922_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_arm922_tlb_invalidate_range(start, end)
 *
 * invalidate TLB entries covering the specified range
 *
 * start: range start address
 * end:   range end address
 */
	.align	5
ENTRY(cpu_arm922_tlb_invalidate_range)
	sub	r3, r1, r0
	cmp	r3, #256 * PAGESIZE		@ arbitary, should be tuned
	bhi	cpu_arm926_tlb_invalidate_all

	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_arm922_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_arm922_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_arm922_set_pgd(pgd)
 *
 * Set the translation base pointer to be as described by pgd.
 *
 * pgd: new page tables
 */
	.align	5
ENTRY(cpu_arm922_set_pgd)
	mov	ip, #0
#ifdef CONFIG_CPU_ARM922_WRITETHROUGH
	/* Any reason why we don't use mcr p15, 0, r0, c7, c7, 0 here? --rmk */
	mcr	p15, 0, ip, c7, c6, 0		@ invalidate D cache
#else
@ && 'Clean & Invalidate whole DCache'
@ && Re-written to use Index Ops.
@ && Uses registers r1, r3 and ip

	mov	r1, #3 << 5			@ 4 segments
1:	orr	r3, r1, #63 << 26		@ 64 entries
2:	mcr	p15, 0, r3, c7, c14, 2		@ clean & invalidate D index
	subs	r3, r3, #1 << 26
	bcs	2b				@ entries 63 to 0
	subs	r1, r1, #1 << 5
	bcs	1b				@ segments 7 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_arm922_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_arm922_set_pmd)
#ifdef CONFIG_CPU_ARM922_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_arm922_set_pte(ptep, pte)
 *
 * Set a PTE and flush it out
 */
	.align	5
ENTRY(cpu_arm922_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_ARM922_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


cpu_manu_name:
	.asciz	"ARM/ALTERA"
ENTRY(cpu_arm922_name)
	.ascii	"Arm922T"
#if defined(CONFIG_CPU_ARM922_CPU_IDLE)
	.ascii	"s"
#endif
#if defined(CONFIG_CPU_ARM922_I_CACHE_ON)
	.ascii	"i"
#endif
#if defined(CONFIG_CPU_ARM922_D_CACHE_ON)
	.ascii	"d"
#if defined(CONFIG_CPU_ARM922_WRITETHROUGH)
	.ascii	"(wt)"
#else
	.ascii	"(wb)"
#endif
#endif
	.ascii	"\0"
	.align

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

__arm922_setup:
	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_ARM922_D_CACHE_ON
	orr	r0, r0, #0x0004			@ .... .... .... .1..
#endif
#ifdef CONFIG_CPU_ARM922_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	arm922_processor_functions, #object
arm922_processor_functions:
	.word	cpu_arm922_data_abort
	.word	cpu_arm922_check_bugs
	.word	cpu_arm922_proc_init
	.word	cpu_arm922_proc_fin
	.word	cpu_arm922_reset
	.word   cpu_arm922_do_idle

	/* cache */
	.word	cpu_arm922_cache_clean_invalidate_all
	.word	cpu_arm922_cache_clean_invalidate_range
	.word	cpu_arm922_flush_ram_page

	/* dcache */
	.word	cpu_arm922_dcache_invalidate_range
	.word	cpu_arm922_dcache_clean_range
	.word	cpu_arm922_dcache_clean_page
	.word	cpu_arm922_dcache_clean_entry

	/* icache */
	.word	cpu_arm922_icache_invalidate_range
	.word	cpu_arm922_icache_invalidate_page

	/* tlb */
	.word	cpu_arm922_tlb_invalidate_all
	.word	cpu_arm922_tlb_invalidate_range
	.word	cpu_arm922_tlb_invalidate_page

	/* pgtable */
	.word	cpu_arm922_set_pgd
	.word	cpu_arm922_set_pmd
	.word	cpu_arm922_set_pte
	.size	arm922_processor_functions, . - arm922_processor_functions

	.type	cpu_arm922_info, #object
cpu_arm922_info:
	.long	cpu_manu_name
	.long	cpu_arm922_name
	.size	cpu_arm922_info, . - cpu_arm922_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

	.section ".proc.info", #alloc, #execinstr

	.type	__arm922_proc_info,#object
__arm922_proc_info:
	.long	0x41009220
	.long	0xff00fff0
	.long	0x00000c1e			@ mmuflags
	b	__arm922_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB | \
		HWCAP_FAST_MULT
	.long	cpu_arm922_info
	.long	arm922_processor_functions
	.size	__arm922_proc_info, . - __arm922_proc_info