proc-xscale.s

LINUX 2.6.17.4的源码

 * Errata 40: must set memory to write-through for user read-only pages.
 */
	.align	5
ENTRY(cpu_xscale_set_pte)
	str	r1, [r0], #-2048		@ linux version

	bic	r2, r1, #0xff0
	orr	r2, r2, #PTE_TYPE_EXT		@ extended page

	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY

	tst	r3, #L_PTE_USER			@ User?
	orrne	r2, r2, #PTE_EXT_AP_URO_SRW	@ yes -> user r/o, system r/w

	tst	r3, #L_PTE_WRITE | L_PTE_DIRTY	@ Write and Dirty?
	orreq	r2, r2, #PTE_EXT_AP_UNO_SRW	@ yes -> user n/a, system r/w
						@ combined with user -> user r/w

	@
	@ Handle the X bit.  We want to set this bit for the minicache
	@ (U = E = B = W = 0, C = 1) or when write allocate is enabled,
	@ and we have a writeable, cacheable region.  If we ignore the
	@ U and E bits, we can allow user space to use the minicache as
	@ well.
	@
	@  X = (C & ~W & ~B) | (C & W & B & write_allocate)
	@
	eor	ip, r1, #L_PTE_CACHEABLE
	tst	ip, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
#if PTE_CACHE_WRITE_ALLOCATE
	eorne	ip, r1, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
	tstne	ip, #L_PTE_CACHEABLE | L_PTE_WRITE | L_PTE_BUFFERABLE
#endif
	orreq	r2, r2, #PTE_EXT_TEX(1)

	@
	@ Erratum 40: The B bit must be cleared for a user read-only
	@ cacheable page.
	@
	@  B = B & ~(U & C & ~W)
	@
	and	ip, r1, #L_PTE_USER | L_PTE_WRITE | L_PTE_CACHEABLE
	teq	ip, #L_PTE_USER | L_PTE_CACHEABLE
	biceq	r2, r2, #PTE_BUFFERABLE

	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ Present and Young?
	movne	r2, #0				@ no -> fault

	str	r2, [r0]			@ hardware version
	mov	ip, #0
	mcr	p15, 0, r0, c7, c10, 1		@ Clean D cache line
	mcr	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mov	pc, lr


	.ltorg

	.align

	__INIT

	.type	__xscale_setup, #function
__xscale_setup:
	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I, D caches & BTB
	mcr	p15, 0, ip, c7, c10, 4		@ Drain Write (& Fill) Buffer
	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I, D TLBs
#ifdef CONFIG_IWMMXT
	mov	r0, #0				@ initially disallow access to CP0/CP1
#else
	mov	r0, #1				@ Allow access to CP0
#endif
	orr     r0, r0, #1 << 6			@ cp6 for IOP3xx and Bulverde
	orr	r0, r0, #1 << 13		@ Its undefined whether this
	mcr	p15, 0, r0, c15, c1, 0		@ affects USR or SVC modes
	mrc	p15, 0, r0, c1, c0, 0		@ get control register
	ldr	r5, xscale_cr1_clear
	bic	r0, r0, r5
	ldr	r5, xscale_cr1_set
	orr	r0, r0, r5
	mov	pc, lr
	.size	__xscale_setup, . - __xscale_setup

	/*
	 *  R
	 * .RVI ZFRS BLDP WCAM
	 * ..11 1.01 .... .101
	 * 
	 */
	.type	xscale_cr1_clear, #object
	.type	xscale_cr1_set, #object
xscale_cr1_clear:
	.word	0x3b07
xscale_cr1_set:
	.word	0x3905

	__INITDATA

/*
 * Purpose : Function pointers used to access above functions - all calls
 *	     come through these
 */

	.type	xscale_processor_functions, #object
ENTRY(xscale_processor_functions)
	.word	v5t_early_abort
	.word	cpu_xscale_proc_init
	.word	cpu_xscale_proc_fin
	.word	cpu_xscale_reset
	.word	cpu_xscale_do_idle
	.word	cpu_xscale_dcache_clean_area
	.word	cpu_xscale_switch_mm
	.word	cpu_xscale_set_pte
	.size	xscale_processor_functions, . - xscale_processor_functions

	.section ".rodata"

	.type	cpu_arch_name, #object
cpu_arch_name:
	.asciz	"armv5te"
	.size	cpu_arch_name, . - cpu_arch_name

	.type	cpu_elf_name, #object
cpu_elf_name:
	.asciz	"v5"
	.size	cpu_elf_name, . - cpu_elf_name

	.type	cpu_80200_name, #object
cpu_80200_name:
	.asciz	"XScale-80200"
	.size	cpu_80200_name, . - cpu_80200_name

	.type	cpu_8032x_name, #object
cpu_8032x_name:
	.asciz	"XScale-IOP8032x Family"
	.size	cpu_8032x_name, . - cpu_8032x_name

	.type	cpu_8033x_name, #object
cpu_8033x_name:
	.asciz	"XScale-IOP8033x Family"
	.size	cpu_8033x_name, . - cpu_8033x_name

	.type	cpu_pxa250_name, #object
cpu_pxa250_name:
	.asciz	"XScale-PXA250"
	.size	cpu_pxa250_name, . - cpu_pxa250_name

	.type	cpu_pxa210_name, #object
cpu_pxa210_name:
	.asciz	"XScale-PXA210"
	.size	cpu_pxa210_name, . - cpu_pxa210_name

	.type	cpu_ixp42x_name, #object
cpu_ixp42x_name:
	.asciz	"XScale-IXP42x Family"
	.size	cpu_ixp42x_name, . - cpu_ixp42x_name

	.type	cpu_ixp46x_name, #object
cpu_ixp46x_name:
	.asciz	"XScale-IXP46x Family"
	.size	cpu_ixp46x_name, . - cpu_ixp46x_name

	.type	cpu_ixp2400_name, #object
cpu_ixp2400_name:
	.asciz	"XScale-IXP2400"
	.size	cpu_ixp2400_name, . - cpu_ixp2400_name

	.type	cpu_ixp2800_name, #object
cpu_ixp2800_name:
	.asciz	"XScale-IXP2800"
	.size	cpu_ixp2800_name, . - cpu_ixp2800_name

	.type	cpu_pxa255_name, #object
cpu_pxa255_name:
	.asciz	"XScale-PXA255"
	.size	cpu_pxa255_name, . - cpu_pxa255_name

	.type	cpu_pxa270_name, #object
cpu_pxa270_name:
	.asciz	"XScale-PXA270"
	.size	cpu_pxa270_name, . - cpu_pxa270_name

	.align

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

	.type	__80200_proc_info,#object
__80200_proc_info:
	.long	0x69052000
	.long	0xfffffff0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	cpu_80200_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size	__80200_proc_info, . - __80200_proc_info

	.type	__8032x_proc_info,#object
__8032x_proc_info:
	.long	0x69052420
	.long	0xfffff5e0      @ mask should accomodate IOP80219 also
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	cpu_8032x_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size	__8032x_proc_info, . - __8032x_proc_info

	.type	__8033x_proc_info,#object
__8033x_proc_info:
	.long	0x69054010
	.long	0xffffff30
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	cpu_8033x_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size	__8033x_proc_info, . - __8033x_proc_info

	.type	__pxa250_proc_info,#object
__pxa250_proc_info:
	.long	0x69052100
	.long	0xfffff7f0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	cpu_pxa250_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size	__pxa250_proc_info, . - __pxa250_proc_info

	.type	__pxa210_proc_info,#object
__pxa210_proc_info:
	.long	0x69052120
	.long	0xfffff3f0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	cpu_pxa210_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size	__pxa210_proc_info, . - __pxa210_proc_info

	.type	__ixp2400_proc_info, #object
__ixp2400_proc_info:
	.long   0x69054190
	.long   0xfffffff0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b       __xscale_setup
	.long   cpu_arch_name
	.long   cpu_elf_name
	.long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long   cpu_ixp2400_name
	.long   xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size   __ixp2400_proc_info, . - __ixp2400_proc_info                

	.type	__ixp2800_proc_info, #object
__ixp2800_proc_info:
	.long   0x690541a0
	.long   0xfffffff0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b       __xscale_setup
	.long   cpu_arch_name
	.long   cpu_elf_name
	.long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long   cpu_ixp2800_name
	.long   xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size   __ixp2800_proc_info, . - __ixp2800_proc_info                

	.type	__ixp42x_proc_info, #object
__ixp42x_proc_info:
	.long   0x690541c0
	.long   0xffffffc0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b       __xscale_setup
	.long   cpu_arch_name
	.long   cpu_elf_name
	.long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long   cpu_ixp42x_name
	.long   xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size   __ixp42x_proc_info, . - __ixp42x_proc_info                

	.type	__ixp46x_proc_info, #object
__ixp46x_proc_info:
	.long   0x69054200
	.long   0xffffff00
	.long   0x00000c0e
	b       __xscale_setup
	.long   cpu_arch_name
	.long   cpu_elf_name
	.long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long   cpu_ixp46x_name
	.long   xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size   __ixp46x_proc_info, . - __ixp46x_proc_info

	.type	__pxa255_proc_info,#object
__pxa255_proc_info:
	.long	0x69052d00
	.long	0xfffffff0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	cpu_pxa255_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size	__pxa255_proc_info, . - __pxa255_proc_info

	.type	__pxa270_proc_info,#object
__pxa270_proc_info:
	.long	0x69054110
	.long	0xfffffff0
	.long   PMD_TYPE_SECT | \
		PMD_SECT_BUFFERABLE | \
		PMD_SECT_CACHEABLE | \
		PMD_SECT_AP_WRITE | \
		PMD_SECT_AP_READ
	b	__xscale_setup
	.long	cpu_arch_name
	.long	cpu_elf_name
	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
	.long	cpu_pxa270_name
	.long	xscale_processor_functions
	.long	v4wbi_tlb_fns
	.long	xscale_mc_user_fns
	.long	xscale_cache_fns
	.size	__pxa270_proc_info, . - __pxa270_proc_info