/* *  linux/arch/arm/mm/proc-arm920.S: MMU functions for ARM920 * *  Copyright (C) 1999,2000 ARM Limited *  Copyright (C) 2000 Deep Blue Solutions Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * * * These are the low level assembler for performing cache and TLB * functions on the arm920. * *  CONFIG_CPU_ARM920_CPU_IDLE -> nohlt */#include <linux/linkage.h>#include <linux/config.h>#include <linux/init.h>#include <asm/assembler.h>#include <asm/pgtable.h>#include <asm/procinfo.h>#include <asm/hardware.h>#include <asm/page.h>#include <asm/ptrace.h>#include "proc-macros.S"/* * The size of one data cache line. */#define CACHE_DLINESIZE	32/* * The number of data cache segments. */#define CACHE_DSEGMENTS	8/* * The number of lines in a cache segment. */#define CACHE_DENTRIES	64/* * This is the size at which it becomes more efficient to * clean the whole cache, rather than using the individual * cache line maintainence instructions. */#define CACHE_DLIMIT	65536	.text/* * cpu_arm920_proc_init() */ENTRY(cpu_arm920_proc_init)	mov	pc, lr/* * cpu_arm920_proc_fin() */ENTRY(cpu_arm920_proc_fin)	stmfd	sp!, {lr}	mov	ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE	msr	cpsr_c, ip#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH	bl	arm920_flush_kern_cache_all#else	bl	v4wt_flush_kern_cache_all#endif	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register	bic	r0, r0, #0x1000			@ ...i............	bic	r0, r0, #0x000e			@ ............wca.	mcr	p15, 0, r0, c1, c0, 0		@ disable caches	ldmfd	sp!, {pc}/* * cpu_arm920_reset(loc) * * Perform a soft reset of the system.  Put the CPU into the * same state as it would be if it had been reset, and branch * to what would be the reset vector. * * loc: location to jump to for soft reset */	.align	5ENTRY(cpu_arm920_reset)	mov	ip, #0	mcr	p15, 0, ip, c7, c7, 0		@ invalidate I,D caches	mcr	p15, 0, ip, c7, c10, 4		@ drain WB	mcr	p15, 0, ip, c8, c7, 0		@ invalidate I & D TLBs	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register	bic	ip, ip, #0x000f			@ ............wcam	bic	ip, ip, #0x1100			@ ...i...s........	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register	mov	pc, r0/* * cpu_arm920_do_idle() */	.align	5ENTRY(cpu_arm920_do_idle)	mcr	p15, 0, r0, c7, c0, 4		@ Wait for interrupt	mov	pc, lr#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH/* *	flush_user_cache_all() * *	Invalidate all cache entries in a particular address *	space. */ENTRY(arm920_flush_user_cache_all)	/* FALLTHROUGH *//* *	flush_kern_cache_all() * *	Clean and invalidate the entire cache. */ENTRY(arm920_flush_kern_cache_all)	mov	r2, #VM_EXEC	mov	ip, #0__flush_whole_cache:	mov	r1, #(CACHE_DSEGMENTS - 1) << 5	@ 8 segments1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries2:	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	tst	r2, #VM_EXEC	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB	mov	pc, lr/* *	flush_user_cache_range(start, end, flags) * *	Invalidate a range of cache entries in the specified *	address space. * *	- start	- start address (inclusive) *	- end	- end address (exclusive) *	- flags	- vm_flags for address space */ENTRY(arm920_flush_user_cache_range)	mov	ip, #0	sub	r3, r1, r0			@ calculate total size	cmp	r3, #CACHE_DLIMIT	bhs	__flush_whole_cache1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry	tst	r2, #VM_EXEC	mcrne	p15, 0, r0, c7, c5, 1		@ invalidate I entry	add	r0, r0, #CACHE_DLINESIZE	cmp	r0, r1	blo	1b	tst	r2, #VM_EXEC	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB	mov	pc, lr/* *	coherent_kern_range(start, end) * *	Ensure coherency between the Icache and the Dcache in the *	region described by start, end.  If you have non-snooping *	Harvard caches, you need to implement this function. * *	- start	- virtual start address *	- end	- virtual end address */ENTRY(arm920_coherent_kern_range)	/* FALLTHROUGH *//* *	coherent_user_range(start, end) * *	Ensure coherency between the Icache and the Dcache in the *	region described by start, end.  If you have non-snooping *	Harvard caches, you need to implement this function. * *	- start	- virtual start address *	- end	- virtual end address */ENTRY(arm920_coherent_user_range)	bic	r0, r0, #CACHE_DLINESIZE - 11:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry	mcr	p15, 0, r0, c7, c5, 1		@ invalidate I entry	add	r0, r0, #CACHE_DLINESIZE	cmp	r0, r1	blo	1b	mcr	p15, 0, r0, c7, c10, 4		@ drain WB	mov	pc, lr/* *	flush_kern_dcache_page(void *page) * *	Ensure no D cache aliasing occurs, either with itself or *	the I cache * *	- addr	- page aligned address */ENTRY(arm920_flush_kern_dcache_page)	add	r1, r0, #PAGE_SZ1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry	add	r0, r0, #CACHE_DLINESIZE	cmp	r0, r1	blo	1b	mov	r0, #0	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache	mcr	p15, 0, r0, c7, c10, 4		@ drain WB	mov	pc, lr/* *	dma_inv_range(start, end) * *	Invalidate (discard) the specified virtual address range. *	May not write back any entries.  If 'start' or 'end' *	are not cache line aligned, those lines must be written *	back. * *	- start	- virtual start address *	- end	- virtual end address * * (same as v4wb) */ENTRY(arm920_dma_inv_range)	tst	r0, #CACHE_DLINESIZE - 1	bic	r0, r0, #CACHE_DLINESIZE - 1	mcrne	p15, 0, r0, c7, c10, 1		@ clean D entry	tst	r1, #CACHE_DLINESIZE - 1	mcrne	p15, 0, r1, c7, c10, 1		@ clean D entry1:	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry	add	r0, r0, #CACHE_DLINESIZE	cmp	r0, r1	blo	1b	mcr	p15, 0, r0, c7, c10, 4		@ drain WB	mov	pc, lr/* *	dma_clean_range(start, end) * *	Clean the specified virtual address range. * *	- start	- virtual start address *	- end	- virtual end address * * (same as v4wb) */ENTRY(arm920_dma_clean_range)	bic	r0, r0, #CACHE_DLINESIZE - 11:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry	add	r0, r0, #CACHE_DLINESIZE	cmp	r0, r1	blo	1b	mcr	p15, 0, r0, c7, c10, 4		@ drain WB	mov	pc, lr/* *	dma_flush_range(start, end) * *	Clean and invalidate the specified virtual address range. * *	- start	- virtual start address *	- end	- virtual end address */ENTRY(arm920_dma_flush_range)	bic	r0, r0, #CACHE_DLINESIZE - 11:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry	add	r0, r0, #CACHE_DLINESIZE	cmp	r0, r1	blo	1b	mcr	p15, 0, r0, c7, c10, 4		@ drain WB	mov	pc, lrENTRY(arm920_cache_fns)	.long	arm920_flush_kern_cache_all	.long	arm920_flush_user_cache_all	.long	arm920_flush_user_cache_range	.long	arm920_coherent_kern_range	.long	arm920_coherent_user_range	.long	arm920_flush_kern_dcache_page	.long	arm920_dma_inv_range	.long	arm920_dma_clean_range	.long	arm920_dma_flush_range#endifENTRY(cpu_arm920_dcache_clean_area)1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry	add	r0, r0, #CACHE_DLINESIZE	subs	r1, r1, #CACHE_DLINESIZE	bhi	1b	mov	pc, lr/* =============================== PageTable ============================== *//* * cpu_arm920_switch_mm(pgd) * * Set the translation base pointer to be as described by pgd. * * pgd: new page tables */	.align	5ENTRY(cpu_arm920_switch_mm)	mov	ip, #0#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH	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, #(CACHE_DSEGMENTS - 1) << 5	@ 8 segments1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries2:	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_arm920_set_pte(ptep, pte) * * Set a PTE and flush it out */	.align	5ENTRY(cpu_arm920_set_pte)	str	r1, [r0], #-2048		@ linux version	eor	r1, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY	bic	r2, r1, #PTE_SMALL_AP_MASK	bic	r2, r2, #PTE_TYPE_MASK	orr	r2, r2, #PTE_TYPE_SMALL	tst	r1, #L_PTE_USER			@ User?	orrne	r2, r2, #PTE_SMALL_AP_URO_SRW	tst	r1, #L_PTE_WRITE | L_PTE_DIRTY	@ Write and Dirty?	orreq	r2, r2, #PTE_SMALL_AP_UNO_SRW	tst	r1, #L_PTE_PRESENT | L_PTE_YOUNG	@ Present and Young?	movne	r2, #0#ifdef CONFIG_CPU_DCACHE_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	__INIT	.type	__arm920_setup, #function__arm920_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	mrc	p15, 0, r0, c1, c0		@ get control register v4	ldr	r5, arm920_cr1_clear	bic	r0, r0, r5	ldr	r5, arm920_cr1_set	orr	r0, r0, r5	mov	pc, lr	.size	__arm920_setup, . - __arm920_setup	/*	 *  R	 * .RVI ZFRS BLDP WCAM	 * ..11 0001 ..11 0101	 * 	 */	.type	arm920_cr1_clear, #object	.type	arm920_cr1_set, #objectarm920_cr1_clear:	.word	0x3f3farm920_cr1_set:	.word	0x3135	__INITDATA/* * Purpose : Function pointers used to access above functions - all calls *	     come through these */	.type	arm920_processor_functions, #objectarm920_processor_functions:	.word	v4t_early_abort	.word	cpu_arm920_proc_init	.word	cpu_arm920_proc_fin	.word	cpu_arm920_reset	.word   cpu_arm920_do_idle	.word	cpu_arm920_dcache_clean_area	.word	cpu_arm920_switch_mm	.word	cpu_arm920_set_pte	.size	arm920_processor_functions, . - arm920_processor_functions	.section ".rodata"	.type	cpu_arch_name, #objectcpu_arch_name:	.asciz	"armv4t"	.size	cpu_arch_name, . - cpu_arch_name	.type	cpu_elf_name, #objectcpu_elf_name:	.asciz	"v4"	.size	cpu_elf_name, . - cpu_elf_name	.type	cpu_arm920_name, #objectcpu_arm920_name:	.ascii	"ARM920T"#ifndef CONFIG_CPU_ICACHE_DISABLE	.ascii	"i"#endif#ifndef CONFIG_CPU_DCACHE_DISABLE	.ascii	"d"#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH	.ascii	"(wt)"#else	.ascii	"(wb)"#endif#endif	.ascii	"\0"	.size	cpu_arm920_name, . - cpu_arm920_name	.align	.section ".proc.info.init", #alloc, #execinstr	.type	__arm920_proc_info,#object__arm920_proc_info:	.long	0x41009200	.long	0xff00fff0	.long   PMD_TYPE_SECT | \		PMD_SECT_BUFFERABLE | \		PMD_SECT_CACHEABLE | \		PMD_BIT4 | \		PMD_SECT_AP_WRITE | \		PMD_SECT_AP_READ	b	__arm920_setup	.long	cpu_arch_name	.long	cpu_elf_name	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB	.long	cpu_arm920_name	.long	arm920_processor_functions	.long	v4wbi_tlb_fns	.long	v4wb_user_fns#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH	.long	arm920_cache_fns#else	.long	v4wt_cache_fns#endif	.size	__arm920_proc_info, . - __arm920_proc_info