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, 517 insertions, 0 deletions

diff --git a/arch/arm26/boot/compressed/head.S b/arch/arm26/boot/compressed/head.S
new file mode 100644
index 00000000000..0307804a607
--- /dev/null
+++ b/arch/arm26/boot/compressed/head.S
@@ -0,0 +1,517 @@
+/*
+ *  linux/arch/arm26/boot/compressed/head.S
+ *
+ *  Copyright (C) 1996-2002 Russell King
+ *
+ * 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.
+ */
+#include <linux/config.h>
+#include <linux/linkage.h>
+
+/*
+ * Debugging stuff
+ *
+ * Note that these macros must not contain any code which is not
+ * 100% relocatable.  Any attempt to do so will result in a crash.
+ * Please select one of the following when turning on debugging.
+ */
+
+		.macro	kputc,val
+		mov	r0, \val
+		bl	putc
+		.endm
+
+		.macro	kphex,val,len
+		mov	r0, \val
+		mov	r1, #\len
+		bl	phex
+		.endm
+
+		.macro	debug_reloc_start
+		.endm
+
+		.macro	debug_reloc_end
+		.endm
+
+		.section ".start", #alloc, #execinstr
+/*
+ * sort out different calling conventions
+ */
+		.align
+start:
+		.type	start,#function
+		.rept	8
+		mov	r0, r0
+		.endr
+
+		b	1f
+		.word	0x016f2818		@ Magic numbers to help the loader
+		.word	start			@ absolute load/run zImage address
+		.word	_edata			@ zImage end address
+1:		mov	r7, r1			@ save architecture ID
+		mov	r8, #0			@ save r0
+		teqp	pc, #0x0c000003		@ turn off interrupts
+
+		.text
+		adr	r0, LC0
+		ldmia	r0, {r1, r2, r3, r4, r5, r6, ip, sp}
+		subs	r0, r0, r1		@ calculate the delta offset
+
+		teq	r0, #0			@ if delta is zero, we're
+		beq	not_relocated		@ running at the address we
+						@ were linked at.
+
+		add	r2, r2, r0		@ different address, so we
+		add	r3, r3, r0		@ need to fix up various
+		add	r5, r5, r0		@ pointers.
+		add	r6, r6, r0
+		add	ip, ip, r0
+		add	sp, sp, r0
+
+1:		ldr	r1, [r6, #0]		@ relocate entries in the GOT
+		add	r1, r1, r0		@ table.  This fixes up the
+		str	r1, [r6], #4		@ C references.
+		cmp	r6, ip
+		blo	1b
+
+not_relocated:	mov	r0, #0
+1:		str	r0, [r2], #4		@ clear bss
+		str	r0, [r2], #4
+		str	r0, [r2], #4
+		str	r0, [r2], #4
+		cmp	r2, r3
+		blo	1b
+
+		bl	cache_on
+
+		mov	r1, sp			@ malloc space above stack
+		add	r2, sp, #0x10000	@ 64k max
+
+/*
+ * Check to see if we will overwrite ourselves.
+ *   r4 = final kernel address
+ *   r5 = start of this image
+ *   r2 = end of malloc space (and therefore this image)
+ * We basically want:
+ *   r4 >= r2 -> OK
+ *   r4 + image length <= r5 -> OK
+ */
+		cmp	r4, r2
+		bhs	wont_overwrite
+		add	r0, r4, #4096*1024	@ 4MB largest kernel size
+		cmp	r0, r5
+		bls	wont_overwrite
+
+		mov	r5, r2			@ decompress after malloc space
+		mov	r0, r5
+		mov	r3, r7
+		bl	decompress_kernel
+
+		add	r0, r0, #127
+		bic	r0, r0, #127		@ align the kernel length
+/*
+ * r0     = decompressed kernel length
+ * r1-r3  = unused
+ * r4     = kernel execution address
+ * r5     = decompressed kernel start
+ * r6     = processor ID
+ * r7     = architecture ID
+ * r8-r14 = unused
+ */
+		add	r1, r5, r0		@ end of decompressed kernel
+		adr	r2, reloc_start
+		ldr	r3, LC1
+		add	r3, r2, r3
+1:		ldmia	r2!, {r8 - r13}		@ copy relocation code
+		stmia	r1!, {r8 - r13}
+		ldmia	r2!, {r8 - r13}
+		stmia	r1!, {r8 - r13}
+		cmp	r2, r3
+		blo	1b
+
+		bl	cache_clean_flush
+		add	pc, r5, r0		@ call relocation code
+
+/*
+ * We're not in danger of overwriting ourselves.  Do this the simple way.
+ *
+ * r4     = kernel execution address
+ * r7     = architecture ID
+ */
+wont_overwrite:	mov	r0, r4
+		mov	r3, r7
+		bl	decompress_kernel
+		b	call_kernel
+
+		.type	LC0, #object
+LC0:		.word	LC0			@ r1
+		.word	__bss_start		@ r2
+		.word	_end			@ r3
+		.word	_load_addr		@ r4
+		.word	_start			@ r5
+		.word	_got_start		@ r6
+		.word	_got_end		@ ip
+		.word	user_stack+4096		@ sp
+LC1:		.word	reloc_end - reloc_start
+		.size	LC0, . - LC0
+
+/*
+ * Turn on the cache.  We need to setup some page tables so that we
+ * can have both the I and D caches on.
+ *
+ * We place the page tables 16k down from the kernel execution address,
+ * and we hope that nothing else is using it.  If we're using it, we
+ * will go pop!
+ *
+ * On entry,
+ *  r4 = kernel execution address
+ *  r6 = processor ID
+ *  r7 = architecture number
+ *  r8 = run-time address of "start"
+ * On exit,
+ *  r1, r2, r3, r8, r9, r12 corrupted
+ * This routine must preserve:
+ *  r4, r5, r6, r7
+ */
+		.align	5
+cache_on:	mov	r3, #8			@ cache_on function
+		b	call_cache_fn
+
+__setup_mmu:	sub	r3, r4, #16384		@ Page directory size
+		bic	r3, r3, #0xff		@ Align the pointer
+		bic	r3, r3, #0x3f00
+/*
+ * Initialise the page tables, turning on the cacheable and bufferable
+ * bits for the RAM area only.
+ */
+		mov	r0, r3
+		mov	r8, r0, lsr #18
+		mov	r8, r8, lsl #18		@ start of RAM
+		add	r9, r8, #0x10000000	@ a reasonable RAM size
+		mov	r1, #0x12
+		orr	r1, r1, #3 << 10
+		add	r2, r3, #16384
+1:		cmp	r1, r8			@ if virt > start of RAM
+		orrhs	r1, r1, #0x0c		@ set cacheable, bufferable
+		cmp	r1, r9			@ if virt > end of RAM
+		bichs	r1, r1, #0x0c		@ clear cacheable, bufferable
+		str	r1, [r0], #4		@ 1:1 mapping
+		add	r1, r1, #1048576
+		teq	r0, r2
+		bne	1b
+/*
+ * If ever we are running from Flash, then we surely want the cache
+ * to be enabled also for our execution instance...  We map 2MB of it
+ * so there is no map overlap problem for up to 1 MB compressed kernel.
+ * If the execution is in RAM then we would only be duplicating the above.
+ */
+		mov	r1, #0x1e
+		orr	r1, r1, #3 << 10
+		mov	r2, pc, lsr #20
+		orr	r1, r1, r2, lsl #20
+		add	r0, r3, r2, lsl #2
+		str	r1, [r0], #4
+		add	r1, r1, #1048576
+		str	r1, [r0]
+		mov	pc, lr
+
+__armv4_cache_on:
+		mov	r12, lr
+		bl	__setup_mmu
+		mov	r0, #0
+		mcr	p15, 0, r0, c7, c10, 4	@ drain write buffer
+		mcr	p15, 0, r0, c8, c7, 0	@ flush I,D TLBs
+		mrc	p15, 0, r0, c1, c0, 0	@ read control reg
+		orr	r0, r0, #0x1000		@ I-cache enable
+		orr	r0, r0, #0x0030
+		b	__common_cache_on
+
+__arm6_cache_on:
+		mov	r12, lr
+		bl	__setup_mmu
+		mov	r0, #0
+		mcr	p15, 0, r0, c7, c0, 0	@ invalidate whole cache v3
+		mcr	p15, 0, r0, c5, c0, 0	@ invalidate whole TLB v3
+		mov	r0, #0x30
+__common_cache_on:
+#ifndef DEBUG
+		orr	r0, r0, #0x000d		@ Write buffer, mmu
+#endif
+		mov	r1, #-1
+		mcr	p15, 0, r3, c2, c0, 0	@ load page table pointer
+		mcr	p15, 0, r1, c3, c0, 0	@ load domain access control
+		mcr	p15, 0, r0, c1, c0, 0	@ load control register
+		mov	pc, r12
+
+/*
+ * All code following this line is relocatable.  It is relocated by
+ * the above code to the end of the decompressed kernel image and
+ * executed there.  During this time, we have no stacks.
+ *
+ * r0     = decompressed kernel length
+ * r1-r3  = unused
+ * r4     = kernel execution address
+ * r5     = decompressed kernel start
+ * r6     = processor ID
+ * r7     = architecture ID
+ * r8-r14 = unused
+ */
+		.align	5
+reloc_start:	add	r8, r5, r0
+		debug_reloc_start
+		mov	r1, r4
+1:
+		.rept	4
+		ldmia	r5!, {r0, r2, r3, r9 - r13}	@ relocate kernel
+		stmia	r1!, {r0, r2, r3, r9 - r13}
+		.endr
+
+		cmp	r5, r8
+		blo	1b
+		debug_reloc_end
+
+call_kernel:	bl	cache_clean_flush
+		bl	cache_off
+		mov	r0, #0
+		mov	r1, r7			@ restore architecture number
+		mov	pc, r4			@ call kernel
+
+/*
+ * Here follow the relocatable cache support functions for the
+ * various processors.  This is a generic hook for locating an
+ * entry and jumping to an instruction at the specified offset
+ * from the start of the block.  Please note this is all position
+ * independent code.
+ *
+ *  r1  = corrupted
+ *  r2  = corrupted
+ *  r3  = block offset
+ *  r6  = corrupted
+ *  r12 = corrupted
+ */
+
+call_cache_fn:	adr	r12, proc_types
+		mrc	p15, 0, r6, c0, c0	@ get processor ID
+1:		ldr	r1, [r12, #0]		@ get value
+		ldr	r2, [r12, #4]		@ get mask
+		eor	r1, r1, r6		@ (real ^ match)
+		tst	r1, r2			@       & mask
+		addeq	pc, r12, r3		@ call cache function
+		add	r12, r12, #4*5
+		b	1b
+
+/*
+ * Table for cache operations.  This is basically:
+ *   - CPU ID match
+ *   - CPU ID mask
+ *   - 'cache on' method instruction
+ *   - 'cache off' method instruction
+ *   - 'cache flush' method instruction
+ *
+ * We match an entry using: ((real_id ^ match) & mask) == 0
+ *
+ * Writethrough caches generally only need 'on' and 'off'
+ * methods.  Writeback caches _must_ have the flush method
+ * defined.
+ */
+		.type	proc_types,#object
+proc_types:
+		.word	0x41560600		@ ARM6/610
+		.word	0xffffffe0
+		b	__arm6_cache_off	@ works, but slow
+		b	__arm6_cache_off
+		mov	pc, lr
+@		b	__arm6_cache_on		@ untested
+@		b	__arm6_cache_off
+@		b	__armv3_cache_flush
+
+		.word	0x41007000		@ ARM7/710
+		.word	0xfff8fe00
+		b	__arm7_cache_off
+		b	__arm7_cache_off
+		mov	pc, lr
+
+		.word	0x41807200		@ ARM720T (writethrough)
+		.word	0xffffff00
+		b	__armv4_cache_on
+		b	__armv4_cache_off
+		mov	pc, lr
+
+		.word	0x41129200		@ ARM920T
+		.word	0xff00fff0
+		b	__armv4_cache_on
+		b	__armv4_cache_off
+		b	__armv4_cache_flush
+
+		.word	0x4401a100		@ sa110 / sa1100
+		.word	0xffffffe0
+		b	__armv4_cache_on
+		b	__armv4_cache_off
+		b	__armv4_cache_flush
+
+		.word	0x6901b110		@ sa1110
+		.word	0xfffffff0
+		b	__armv4_cache_on
+		b	__armv4_cache_off
+		b	__armv4_cache_flush
+
+		.word	0x69050000		@ xscale
+		.word	0xffff0000
+		b	__armv4_cache_on
+		b	__armv4_cache_off
+		b	__armv4_cache_flush
+
+		.word	0			@ unrecognised type
+		.word	0
+		mov	pc, lr
+		mov	pc, lr
+		mov	pc, lr
+
+		.size	proc_types, . - proc_types
+
+/*
+ * Turn off the Cache and MMU.  ARMv3 does not support
+ * reading the control register, but ARMv4 does.
+ *
+ * On entry,  r6 = processor ID
+ * On exit,   r0, r1, r2, r3, r12 corrupted
+ * This routine must preserve: r4, r6, r7
+ */
+		.align	5
+cache_off:	mov	r3, #12			@ cache_off function
+		b	call_cache_fn
+
+__armv4_cache_off:
+		mrc	p15, 0, r0, c1, c0
+		bic	r0, r0, #0x000d
+		mcr	p15, 0, r0, c1, c0	@ turn MMU and cache off
+		mov	r0, #0
+		mcr	p15, 0, r0, c7, c7	@ invalidate whole cache v4
+		mcr	p15, 0, r0, c8, c7	@ invalidate whole TLB v4
+		mov	pc, lr
+
+__arm6_cache_off:
+		mov	r0, #0x00000030		@ ARM6 control reg.
+		b	__armv3_cache_off
+
+__arm7_cache_off:
+		mov	r0, #0x00000070		@ ARM7 control reg.
+		b	__armv3_cache_off
+
+__armv3_cache_off:
+		mcr	p15, 0, r0, c1, c0, 0	@ turn MMU and cache off
+		mov	r0, #0
+		mcr	p15, 0, r0, c7, c0, 0	@ invalidate whole cache v3
+		mcr	p15, 0, r0, c5, c0, 0	@ invalidate whole TLB v3
+		mov	pc, lr
+
+/*
+ * Clean and flush the cache to maintain consistency.
+ *
+ * On entry,
+ *  r6 = processor ID
+ * On exit,
+ *  r1, r2, r3, r12 corrupted
+ * This routine must preserve:
+ *  r0, r4, r5, r6, r7
+ */
+		.align	5
+cache_clean_flush:
+		mov	r3, #16
+		b	call_cache_fn
+
+__armv4_cache_flush:
+		bic	r1, pc, #31
+		add	r2, r1, #65536		@ 2x the largest dcache size
+1:		ldr	r12, [r1], #32		@ s/w flush D cache
+		teq	r1, r2
+		bne	1b
+
+		mcr	p15, 0, r1, c7, c7, 0	@ flush I cache
+		mcr	p15, 0, r1, c7, c10, 4	@ drain WB
+		mov	pc, lr
+
+__armv3_cache_flush:
+		mov	r1, #0
+		mcr	p15, 0, r0, c7, c0, 0	@ invalidate whole cache v3
+		mov	pc, lr
+
+/*
+ * Various debugging routines for printing hex characters and
+ * memory, which again must be relocatable.
+ */
+#ifdef DEBUG
+		.type	phexbuf,#object
+phexbuf:	.space	12
+		.size	phexbuf, . - phexbuf
+
+phex:		adr	r3, phexbuf
+		mov	r2, #0
+		strb	r2, [r3, r1]
+1:		subs	r1, r1, #1
+		movmi	r0, r3
+		bmi	puts
+		and	r2, r0, #15
+		mov	r0, r0, lsr #4
+		cmp	r2, #10
+		addge	r2, r2, #7
+		add	r2, r2, #'0'
+		strb	r2, [r3, r1]
+		b	1b
+
+puts:		loadsp	r3
+1:		ldrb	r2, [r0], #1
+		teq	r2, #0
+		moveq	pc, lr
+2:		writeb	r2
+		mov	r1, #0x00020000
+3:		subs	r1, r1, #1
+		bne	3b
+		teq	r2, #'\n'
+		moveq	r2, #'\r'
+		beq	2b
+		teq	r0, #0
+		bne	1b
+		mov	pc, lr
+putc:
+		mov	r2, r0
+		mov	r0, #0
+		loadsp	r3
+		b	2b
+
+memdump:	mov	r12, r0
+		mov	r10, lr
+		mov	r11, #0
+2:		mov	r0, r11, lsl #2
+		add	r0, r0, r12
+		mov	r1, #8
+		bl	phex
+		mov	r0, #':'
+		bl	putc
+1:		mov	r0, #' '
+		bl	putc
+		ldr	r0, [r12, r11, lsl #2]
+		mov	r1, #8
+		bl	phex
+		and	r0, r11, #7
+		teq	r0, #3
+		moveq	r0, #' '
+		bleq	putc
+		and	r0, r11, #7
+		add	r11, r11, #1
+		teq	r0, #7
+		bne	1b
+		mov	r0, #'\n'
+		bl	putc
+		cmp	r11, #64
+		blt	2b
+		mov	pc, r10
+#endif
+
+reloc_end:
+
+		.align
+		.section ".stack", "aw"
+user_stack:	.space	4096