Linux-2.6.12-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, 272 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
new file mode 100644
index 0000000..0aa73d4
--- /dev/null
+++ b/arch/arm/mm/proc-v6.S
@@ -0,0 +1,272 @@
+/*
+ *  linux/arch/arm/mm/proc-v6.S
+ *
+ *  Copyright (C) 2001 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 version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  This is the "shell" of the ARMv6 processor support.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/constants.h>
+#include <asm/procinfo.h>
+#include <asm/pgtable.h>
+
+#include "proc-macros.S"
+
+#define D_CACHE_LINE_SIZE	32
+
+	.macro	cpsie, flags
+	.ifc \flags, f
+	.long	0xf1080040
+	.exitm
+	.endif
+	.ifc \flags, i
+	.long	0xf1080080
+	.exitm
+	.endif
+	.ifc \flags, if
+	.long	0xf10800c0
+	.exitm
+	.endif
+	.err
+	.endm
+
+	.macro	cpsid, flags
+	.ifc \flags, f
+	.long	0xf10c0040
+	.exitm
+	.endif
+	.ifc \flags, i
+	.long	0xf10c0080
+	.exitm
+	.endif
+	.ifc \flags, if
+	.long	0xf10c00c0
+	.exitm
+	.endif
+	.err
+	.endm
+
+ENTRY(cpu_v6_proc_init)
+	mov	pc, lr
+
+ENTRY(cpu_v6_proc_fin)
+	mov	pc, lr
+
+/*
+ *	cpu_v6_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
+ *
+ *	It is assumed that:
+ */
+	.align	5
+ENTRY(cpu_v6_reset)
+	mov	pc, r0
+
+/*
+ *	cpu_v6_do_idle()
+ *
+ *	Idle the processor (eg, wait for interrupt).
+ *
+ *	IRQs are already disabled.
+ */
+ENTRY(cpu_v6_do_idle)
+	mcr	p15, 0, r1, c7, c0, 4		@ wait for interrupt
+	mov	pc, lr
+
+ENTRY(cpu_v6_dcache_clean_area)
+#ifndef TLB_CAN_READ_FROM_L1_CACHE
+1:	mcr	p15, 0, r0, c7, c10, 1		@ clean D entry
+	add	r0, r0, #D_CACHE_LINE_SIZE
+	subs	r1, r1, #D_CACHE_LINE_SIZE
+	bhi	1b
+#endif
+	mov	pc, lr
+
+/*
+ *	cpu_arm926_switch_mm(pgd_phys, tsk)
+ *
+ *	Set the translation table base pointer to be pgd_phys
+ *
+ *	- pgd_phys - physical address of new TTB
+ *
+ *	It is assumed that:
+ *	- we are not using split page tables
+ */
+ENTRY(cpu_v6_switch_mm)
+	mov	r2, #0
+	ldr	r1, [r1, #MM_CONTEXT_ID]	@ get mm->context.id
+	mcr     p15, 0, r2, c7, c5, 6           @ flush BTAC/BTB
+	mcr	p15, 0, r2, c7, c10, 4		@ drain write buffer
+	mcr	p15, 0, r0, c2, c0, 0		@ set TTB 0
+	mcr	p15, 0, r1, c13, c0, 1		@ set context ID
+	mov	pc, lr
+
+#define nG	(1 << 11)
+#define APX	(1 << 9)
+#define AP1	(1 << 5)
+#define AP0	(1 << 4)
+#define XN	(1 << 0)
+
+/*
+ *	cpu_v6_set_pte(ptep, pte)
+ *
+ *	Set a level 2 translation table entry.
+ *
+ *	- ptep  - pointer to level 2 translation table entry
+ *		  (hardware version is stored at -1024 bytes)
+ *	- pte   - PTE value to store
+ *
+ *	Permissions:
+ *	  YUWD  APX AP1 AP0	SVC	User
+ *	  0xxx   0   0   0	no acc	no acc
+ *	  100x   1   0   1	r/o	no acc
+ *	  10x0   1   0   1	r/o	no acc
+ *	  1011   0   0   1	r/w	no acc
+ *	  110x   1   1   0	r/o	r/o
+ *	  11x0   1   1   0	r/o	r/o
+ *	  1111   0   1   1	r/w	r/w
+ */
+ENTRY(cpu_v6_set_pte)
+	str	r1, [r0], #-2048		@ linux version
+
+	bic	r2, r1, #0x00000ff0
+	bic	r2, r2, #0x00000003
+	orr	r2, r2, #AP0 | 2
+
+	tst	r1, #L_PTE_WRITE
+	tstne	r1, #L_PTE_DIRTY
+	orreq	r2, r2, #APX
+
+	tst	r1, #L_PTE_USER
+	orrne	r2, r2, #AP1 | nG
+	tstne	r2, #APX
+	eorne	r2, r2, #AP0
+
+	tst	r1, #L_PTE_YOUNG
+	biceq	r2, r2, #APX | AP1 | AP0
+
+@	tst	r1, #L_PTE_EXEC
+@	orreq	r2, r2, #XN
+
+	tst	r1, #L_PTE_PRESENT
+	moveq	r2, #0
+
+	str	r2, [r0]
+	mcr	p15, 0, r0, c7, c10, 1 @ flush_pte
+	mov	pc, lr
+
+
+
+
+cpu_v6_name:
+	.asciz	"Some Random V6 Processor"
+	.align
+
+	.section ".text.init", #alloc, #execinstr
+
+/*
+ *	__v6_setup
+ *
+ *	Initialise TLB, Caches, and MMU state ready to switch the MMU
+ *	on.  Return in r0 the new CP15 C1 control register setting.
+ *
+ *	We automatically detect if we have a Harvard cache, and use the
+ *	Harvard cache control instructions insead of the unified cache
+ *	control instructions.
+ *
+ *	This should be able to cover all ARMv6 cores.
+ *
+ *	It is assumed that:
+ *	- cache type register is implemented
+ */
+__v6_setup:
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c14, 0		@ clean+invalidate D cache
+	mcr	p15, 0, r0, c7, c5, 0		@ invalidate I cache
+	mcr	p15, 0, r0, c7, c15, 0		@ clean+invalidate cache
+	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer
+	mcr	p15, 0, r0, c8, c7, 0		@ invalidate I + D TLBs
+	mcr	p15, 0, r0, c2, c0, 2		@ TTB control register
+	mcr	p15, 0, r4, c2, c0, 1		@ load TTB1
+#ifdef CONFIG_VFP
+	mrc	p15, 0, r0, c1, c0, 2
+	orr	r0, r0, #(3 << 20)
+	mcr	p15, 0, r0, c1, c0, 2		@ Enable full access to VFP
+#endif
+	mrc	p15, 0, r0, c1, c0, 0		@ read control register
+	ldr	r5, v6_cr1_clear		@ get mask for bits to clear
+	bic	r0, r0, r5			@ clear bits them
+	ldr	r5, v6_cr1_set			@ get mask for bits to set
+	orr	r0, r0, r5			@ set them
+	mov	pc, lr				@ return to head.S:__ret
+
+	/*
+	 *         V X F   I D LR
+	 * .... ...E PUI. .T.T 4RVI ZFRS BLDP WCAM
+	 * rrrr rrrx xxx0 0101 xxxx xxxx x111 xxxx < forced
+	 *         0 110       0011 1.00 .111 1101 < we want
+	 */
+	.type	v6_cr1_clear, #object
+	.type	v6_cr1_set, #object
+v6_cr1_clear:
+	.word	0x01e0fb7f
+v6_cr1_set:
+	.word	0x00c0387d
+
+	.type	v6_processor_functions, #object
+ENTRY(v6_processor_functions)
+	.word	v6_early_abort
+	.word	cpu_v6_proc_init
+	.word	cpu_v6_proc_fin
+	.word	cpu_v6_reset
+	.word	cpu_v6_do_idle
+	.word	cpu_v6_dcache_clean_area
+	.word	cpu_v6_switch_mm
+	.word	cpu_v6_set_pte
+	.size	v6_processor_functions, . - v6_processor_functions
+
+	.type	cpu_arch_name, #object
+cpu_arch_name:
+	.asciz	"armv6"
+	.size	cpu_arch_name, . - cpu_arch_name
+
+	.type	cpu_elf_name, #object
+cpu_elf_name:
+	.asciz	"v6"
+	.size	cpu_elf_name, . - cpu_elf_name
+	.align
+
+	.section ".proc.info", #alloc, #execinstr
+
+	/*
+	 * Match any ARMv6 processor core.
+	 */
+	.type	__v6_proc_info, #object
+__v6_proc_info:
+	.long	0x0007b000
+	.long	0x0007f000
+	.long   PMD_TYPE_SECT | \
+		PMD_SECT_BUFFERABLE | \
+		PMD_SECT_CACHEABLE | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ
+	b	__v6_setup
+	.long	cpu_arch_name
+	.long	cpu_elf_name
+	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_VFP|HWCAP_EDSP|HWCAP_JAVA
+	.long	cpu_v6_name
+	.long	v6_processor_functions
+	.long	v6wbi_tlb_fns
+	.long	v6_user_fns
+	.long	v6_cache_fns
+	.size	__v6_proc_info, . - __v6_proc_info