Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 530 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-arm1020.S b/arch/arm/mm/proc-arm1020.S
new file mode 100644
index 00000000000..1f325231b9e
--- /dev/null
+++ b/arch/arm/mm/proc-arm1020.S
@@ -0,0 +1,530 @@
+/*
+ *  linux/arch/arm/mm/proc-arm1020.S: MMU functions for ARM1020
+ *
+ *  Copyright (C) 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 arm1020.
+ *
+ *  CONFIG_CPU_ARM1020_CPU_IDLE -> nohlt
+ */
+#include <linux/linkage.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <asm/assembler.h>
+#include <asm/constants.h>
+#include <asm/pgtable.h>
+#include <asm/procinfo.h>
+#include <asm/ptrace.h>
+#include <asm/hardware.h>
+
+/*
+ * This is the maximum size of an area which will be invalidated
+ * using the single invalidate entry instructions.  Anything larger
+ * than this, and we go for the whole cache.
+ *
+ * This value should be chosen such that we choose the cheapest
+ * alternative.
+ */
+#define MAX_AREA_SIZE	32768
+
+/*
+ * The size of one data cache line.
+ */
+#define CACHE_DLINESIZE	32
+
+/*
+ * The number of data cache segments.
+ */
+#define CACHE_DSEGMENTS	16
+
+/*
+ * 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	32768
+
+	.text
+/*
+ * cpu_arm1020_proc_init()
+ */
+ENTRY(cpu_arm1020_proc_init)
+	mov	pc, lr
+
+/*
+ * cpu_arm1020_proc_fin()
+ */
+ENTRY(cpu_arm1020_proc_fin)
+	stmfd	sp!, {lr}
+	mov	ip, #PSR_F_BIT | PSR_I_BIT | SVC_MODE
+	msr	cpsr_c, ip
+	bl	arm1020_flush_kern_cache_all
+	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_arm1020_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	5
+ENTRY(cpu_arm1020_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_arm1020_do_idle()
+ */
+	.align	5
+ENTRY(cpu_arm1020_do_idle)
+	mcr	p15, 0, r0, c7, c0, 4		@ Wait for interrupt
+	mov	pc, lr
+
+/* ================================= CACHE ================================ */
+
+	.align	5
+/*
+ *	flush_user_cache_all()
+ *
+ *	Invalidate all cache entries in a particular address
+ *	space.
+ */
+ENTRY(arm1020_flush_user_cache_all)
+	/* FALLTHROUGH */
+/*
+ *	flush_kern_cache_all()
+ *
+ *	Clean and invalidate the entire cache.
+ */
+ENTRY(arm1020_flush_kern_cache_all)
+	mov	r2, #VM_EXEC
+	mov	ip, #0
+__flush_whole_cache:
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	mov	r1, #(CACHE_DSEGMENTS - 1) << 5	@ 16 segments
+1:	orr	r3, r1, #(CACHE_DENTRIES - 1) << 26 @ 64 entries
+2:	mcr	p15, 0, r3, c7, c14, 2		@ clean+invalidate D index
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	subs	r3, r3, #1 << 26
+	bcs	2b				@ entries 63 to 0
+	subs	r1, r1, #1 << 5
+	bcs	1b				@ segments 15 to 0
+#endif
+	tst	r2, #VM_EXEC
+#ifndef CONFIG_CPU_ICACHE_DISABLE
+	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache
+#endif
+	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 this space
+ */
+ENTRY(arm1020_flush_user_cache_range)
+	mov	ip, #0
+	sub	r3, r1, r0			@ calculate total size
+	cmp	r3, #CACHE_DLIMIT
+	bhs	__flush_whole_cache
+
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	mcr	p15, 0, ip, c7, c10, 4
+1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+#endif
+	tst	r2, #VM_EXEC
+#ifndef CONFIG_CPU_ICACHE_DISABLE
+	mcrne	p15, 0, ip, c7, c5, 0		@ invalidate I cache
+#endif
+	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.  If you have non-snooping
+ *	Harvard caches, you need to implement this function.
+ *
+ *	- start	- virtual start address
+ *	- end	- virtual end address
+ */
+ENTRY(arm1020_coherent_kern_range)
+	/* FALLTRHOUGH */
+
+/*
+ *	coherent_user_range(start, end)
+ *
+ *	Ensure coherency between the Icache and the Dcache in the
+ *	region described by start.  If you have non-snooping
+ *	Harvard caches, you need to implement this function.
+ *
+ *	- start	- virtual start address
+ *	- end	- virtual end address
+ */
+ENTRY(arm1020_coherent_user_range)
+	mov	ip, #0
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+	mcr	p15, 0, ip, c7, c10, 4
+1:
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+#endif
+#ifndef CONFIG_CPU_ICACHE_DISABLE
+	mcr	p15, 0, r0, c7, c5, 1		@ invalidate I entry
+#endif
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+	mcr	p15, 0, ip, 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
+ *
+ *	- page	- page aligned address
+ */
+ENTRY(arm1020_flush_kern_dcache_page)
+	mov	ip, #0
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	add	r1, r0, #PAGE_SZ
+1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+#endif
+	mcr	p15, 0, ip, 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(arm1020_dma_inv_range)
+	mov	ip, #0
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	tst	r0, #CACHE_DLINESIZE - 1
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+	mcrne	p15, 0, ip, c7, c10, 4
+	mcrne	p15, 0, r0, c7, c10, 1		@ clean D entry
+	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
+	tst	r1, #CACHE_DLINESIZE - 1
+	mcrne	p15, 0, ip, c7, c10, 4
+	mcrne	p15, 0, r1, c7, c10, 1		@ clean D entry
+	mcrne	p15, 0, ip, c7, c10, 4		@ drain WB
+1:	mcr	p15, 0, r0, c7, c6, 1		@ invalidate D entry
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+#endif
+	mcr	p15, 0, ip, 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(arm1020_dma_clean_range)
+	mov	ip, #0
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+#endif
+	mcr	p15, 0, ip, 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(arm1020_dma_flush_range)
+	mov	ip, #0
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	bic	r0, r0, #CACHE_DLINESIZE - 1
+	mcr	p15, 0, ip, c7, c10, 4
+1:	mcr	p15, 0, r0, c7, c14, 1		@ clean+invalidate D entry
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	add	r0, r0, #CACHE_DLINESIZE
+	cmp	r0, r1
+	blo	1b
+#endif
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	mov	pc, lr
+
+ENTRY(arm1020_cache_fns)
+	.long	arm1020_flush_kern_cache_all
+	.long	arm1020_flush_user_cache_all
+	.long	arm1020_flush_user_cache_range
+	.long	arm1020_coherent_kern_range
+	.long	arm1020_coherent_user_range
+	.long	arm1020_flush_kern_dcache_page
+	.long	arm1020_dma_inv_range
+	.long	arm1020_dma_clean_range
+	.long	arm1020_dma_flush_range
+
+	.align	5
+ENTRY(cpu_arm1020_dcache_clean_area)
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	mov	ip, #0
+1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
+	add	r0, r0, #CACHE_DLINESIZE
+	subs	r1, r1, #CACHE_DLINESIZE
+	bhi	1b
+#endif
+	mov	pc, lr
+
+/* =============================== PageTable ============================== */
+
+/*
+ * cpu_arm1020_switch_mm(pgd)
+ *
+ * Set the translation base pointer to be as described by pgd.
+ *
+ * pgd: new page tables
+ */
+	.align	5
+ENTRY(cpu_arm1020_switch_mm)
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	mcr	p15, 0, r3, c7, c10, 4
+	mov	r1, #0xF			@ 16 segments
+1:	mov	r3, #0x3F			@ 64 entries
+2:	mov	ip, r3, LSL #26 		@ shift up entry
+	orr	ip, ip, r1, LSL #5		@ shift in/up index
+	mcr	p15, 0, ip, c7, c14, 2		@ Clean & Inval DCache entry
+	mov	ip, #0
+	mcr	p15, 0, ip, c7, c10, 4
+	subs	r3, r3, #1
+	cmp	r3, #0
+	bge	2b				@ entries 3F to 0
+	subs	r1, r1, #1
+	cmp	r1, #0
+	bge	1b				@ segments 15 to 0
+
+#endif
+	mov	r1, #0
+#ifndef CONFIG_CPU_ICACHE_DISABLE
+	mcr	p15, 0, r1, c7, c5, 0		@ invalidate I cache
+#endif
+	mcr	p15, 0, r1, c7, c10, 4		@ drain WB
+	mcr	p15, 0, r0, c2, c0, 0		@ load page table pointer
+	mcr	p15, 0, r1, c8, c7, 0		@ invalidate I & D TLBs
+	mov	pc, lr
+        
+/*
+ * cpu_arm1020_set_pte(ptep, pte)
+ *
+ * Set a PTE and flush it out
+ */
+	.align	5
+ENTRY(cpu_arm1020_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, r1, #0x0a			@ C & small page?
+	tst	r3, #0x0b
+	biceq	r2, r2, #4
+#endif
+	str	r2, [r0]			@ hardware version
+	mov	r0, r0
+#ifndef CONFIG_CPU_DCACHE_DISABLE
+	mcr	p15, 0, r0, c7, c10, 4
+	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+#endif
+	mcr	p15, 0, r0, c7, c10, 4		@ drain WB
+	mov	pc, lr
+
+	__INIT
+
+	.type	__arm1020_setup, #function
+__arm1020_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, arm1020_cr1_clear
+	bic	r0, r0, r5
+	ldr	r5, arm1020_cr1_set
+	orr	r0, r0, r5
+#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
+	orr	r0, r0, #0x4000 		@ .R.. .... .... ....
+#endif
+	mov	pc, lr
+	.size	__arm1020_setup, . - __arm1020_setup
+
+	/*
+	 *  R
+	 * .RVI ZFRS BLDP WCAM
+	 * .0.1 1001 ..11 0101	/* FIXME: why no V bit? */
+	 */
+	.type	arm1020_cr1_clear, #object
+	.type	arm1020_cr1_set, #object
+arm1020_cr1_clear:
+	.word	0x593f
+arm1020_cr1_set:
+	.word	0x1935
+
+	__INITDATA
+
+/*
+ * Purpose : Function pointers used to access above functions - all calls
+ *	     come through these
+ */
+	.type	arm1020_processor_functions, #object
+arm1020_processor_functions:
+	.word	v4t_early_abort
+	.word	cpu_arm1020_proc_init
+	.word	cpu_arm1020_proc_fin
+	.word	cpu_arm1020_reset
+	.word	cpu_arm1020_do_idle
+	.word	cpu_arm1020_dcache_clean_area
+	.word	cpu_arm1020_switch_mm
+	.word	cpu_arm1020_set_pte
+	.size	arm1020_processor_functions, . - arm1020_processor_functions
+
+	.section ".rodata"
+
+	.type	cpu_arch_name, #object
+cpu_arch_name:
+	.asciz	"armv5t"
+	.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_arm1020_name, #object
+cpu_arm1020_name:
+	.ascii	"ARM1020"
+#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
+#ifndef CONFIG_CPU_BPREDICT_DISABLE
+	.ascii	"B"
+#endif
+#ifdef CONFIG_CPU_CACHE_ROUND_ROBIN
+	.ascii	"RR"
+#endif
+	.ascii	"\0"
+	.size	cpu_arm1020_name, . - cpu_arm1020_name
+
+	.align
+
+	.section ".proc.info", #alloc, #execinstr
+
+	.type	__arm1020_proc_info,#object
+__arm1020_proc_info:
+	.long	0x4104a200			@ ARM 1020T (Architecture v5T)
+	.long	0xff0ffff0
+	.long   PMD_TYPE_SECT | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ
+	b	__arm1020_setup
+	.long	cpu_arch_name
+	.long	cpu_elf_name
+	.long	HWCAP_SWP | HWCAP_HALF | HWCAP_THUMB
+	.long	cpu_arm1020_name
+	.long	arm1020_processor_functions
+	.long	v4wbi_tlb_fns
+	.long	v4wb_user_fns
+	.long	arm1020_cache_fns
+	.size	__arm1020_proc_info, . - __arm1020_proc_info