[deliverable/linux.git] / arch / arm / kernel / head.S

/*
 *  linux/arch/arm/kernel/head.S
 *
 *  Copyright (C) 1994-2002 Russell King
 *  Copyright (c) 2003 ARM Limited
 *  All Rights Reserved
 *
 * 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.
 *
 *  Kernel startup code for all 32-bit CPUs
 */
#include <linux/linkage.h>
#include <linux/init.h>

#include <asm/assembler.h>
#include <asm/domain.h>
#include <asm/ptrace.h>
#include <asm/asm-offsets.h>
#include <asm/memory.h>
#include <asm/thread_info.h>
#include <asm/system.h>

#if (PHYS_OFFSET & 0x001fffff)
#error "PHYS_OFFSET must be at an even 2MiB boundary!"
#endif

#define KERNEL_RAM_VADDR	(PAGE_OFFSET + TEXT_OFFSET)
#define KERNEL_RAM_PADDR	(PHYS_OFFSET + TEXT_OFFSET)


/*
 * swapper_pg_dir is the virtual address of the initial page table.
 * We place the page tables 16K below KERNEL_RAM_VADDR.  Therefore, we must
 * make sure that KERNEL_RAM_VADDR is correctly set.  Currently, we expect
 * the least significant 16 bits to be 0x8000, but we could probably
 * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000.
 */
#if (KERNEL_RAM_VADDR & 0xffff) != 0x8000
#error KERNEL_RAM_VADDR must start at 0xXXXX8000
#endif

	.globl	swapper_pg_dir
	.equ	swapper_pg_dir, KERNEL_RAM_VADDR - 0x4000

	.macro	pgtbl, rd
	ldr	\rd, =(KERNEL_RAM_PADDR - 0x4000)
	.endm

#ifdef CONFIG_XIP_KERNEL
#define KERNEL_START	XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
#define KERNEL_END	_edata_loc
#else
#define KERNEL_START	KERNEL_RAM_VADDR
#define KERNEL_END	_end
#endif

/*
 * Kernel startup entry point.
 * ---------------------------
 *
 * This is normally called from the decompressor code.  The requirements
 * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0,
 * r1 = machine nr, r2 = atags pointer.
 *
 * This code is mostly position independent, so if you link the kernel at
 * 0xc0008000, you call this at __pa(0xc0008000).
 *
 * See linux/arch/arm/tools/mach-types for the complete list of machine
 * numbers for r1.
 *
 * We're trying to keep crap to a minimum; DO NOT add any machine specific
 * crap here - that's what the boot loader (or in extreme, well justified
 * circumstances, zImage) is for.
 */
	.section ".text.head", "ax"
ENTRY(stext)
	setmode	PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode
						@ and irqs disabled
	mrc	p15, 0, r9, c0, c0		@ get processor id
	bl	__lookup_processor_type		@ r5=procinfo r9=cpuid
	movs	r10, r5				@ invalid processor (r5=0)?
	beq	__error_p			@ yes, error 'p'
	bl	__lookup_machine_type		@ r5=machinfo
	movs	r8, r5				@ invalid machine (r5=0)?
	beq	__error_a			@ yes, error 'a'
	bl	__vet_atags
	bl	__create_page_tables

	/*
	 * The following calls CPU specific code in a position independent
	 * manner.  See arch/arm/mm/proc-*.S for details.  r10 = base of
	 * xxx_proc_info structure selected by __lookup_machine_type
	 * above.  On return, the CPU will be ready for the MMU to be
	 * turned on, and r0 will hold the CPU control register value.
	 */
	ldr	r13, __switch_data		@ address to jump to after
						@ mmu has been enabled
	adr	lr, BSYM(__enable_mmu)		@ return (PIC) address
 ARM(	add	pc, r10, #PROCINFO_INITFUNC	)
 THUMB(	add	r12, r10, #PROCINFO_INITFUNC	)
 THUMB(	mov	pc, r12				)
ENDPROC(stext)

#if defined(CONFIG_SMP)
ENTRY(secondary_startup)
	/*
	 * Common entry point for secondary CPUs.
	 *
	 * Ensure that we're in SVC mode, and IRQs are disabled.  Lookup
	 * the processor type - there is no need to check the machine type
	 * as it has already been validated by the primary processor.
	 */
	setmode	PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9
	mrc	p15, 0, r9, c0, c0		@ get processor id
	bl	__lookup_processor_type
	movs	r10, r5				@ invalid processor?
	moveq	r0, #'p'			@ yes, error 'p'
	beq	__error

	/*
	 * Use the page tables supplied from  __cpu_up.
	 */
	adr	r4, __secondary_data
	ldmia	r4, {r5, r7, r12}		@ address to jump to after
	sub	r4, r4, r5			@ mmu has been enabled
	ldr	r4, [r7, r4]			@ get secondary_data.pgdir
	adr	lr, BSYM(__enable_mmu)		@ return address
	mov	r13, r12			@ __secondary_switched address
 ARM(	add	pc, r10, #PROCINFO_INITFUNC	) @ initialise processor
						  @ (return control reg)
 THUMB(	add	r12, r10, #PROCINFO_INITFUNC	)
 THUMB(	mov	pc, r12				)
ENDPROC(secondary_startup)

	/*
	 * r6  = &secondary_data
	 */
ENTRY(__secondary_switched)
	ldr	sp, [r7, #4]			@ get secondary_data.stack
	mov	fp, #0
	b	secondary_start_kernel
ENDPROC(__secondary_switched)

	.type	__secondary_data, %object
__secondary_data:
	.long	.
	.long	secondary_data
	.long	__secondary_switched
#endif /* defined(CONFIG_SMP) */


/*
 * Setup common bits before finally enabling the MMU.  Essentially
 * this is just loading the page table pointer and domain access
 * registers.
 */
__enable_mmu:
#ifdef CONFIG_ALIGNMENT_TRAP
	orr	r0, r0, #CR_A
#else
	bic	r0, r0, #CR_A
#endif
#ifdef CONFIG_CPU_DCACHE_DISABLE
	bic	r0, r0, #CR_C
#endif
#ifdef CONFIG_CPU_BPREDICT_DISABLE
	bic	r0, r0, #CR_Z
#endif
#ifdef CONFIG_CPU_ICACHE_DISABLE
	bic	r0, r0, #CR_I
#endif
	mov	r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \
		      domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \
		      domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \
		      domain_val(DOMAIN_IO, DOMAIN_CLIENT))
	mcr	p15, 0, r5, c3, c0, 0		@ load domain access register
	mcr	p15, 0, r4, c2, c0, 0		@ load page table pointer
	b	__turn_mmu_on
ENDPROC(__enable_mmu)

/*
 * Enable the MMU.  This completely changes the structure of the visible
 * memory space.  You will not be able to trace execution through this.
 * If you have an enquiry about this, *please* check the linux-arm-kernel
 * mailing list archives BEFORE sending another post to the list.
 *
 *  r0  = cp#15 control register
 *  r13 = *virtual* address to jump to upon completion
 *
 * other registers depend on the function called upon completion
 */
	.align	5
__turn_mmu_on:
	mov	r0, r0
	mcr	p15, 0, r0, c1, c0, 0		@ write control reg
	mrc	p15, 0, r3, c0, c0, 0		@ read id reg
	mov	r3, r3
	mov	r3, r13
	mov	pc, r3
ENDPROC(__turn_mmu_on)


/*
 * Setup the initial page tables.  We only setup the barest
 * amount which are required to get the kernel running, which
 * generally means mapping in the kernel code.
 *
 * r8  = machinfo
 * r9  = cpuid
 * r10 = procinfo
 *
 * Returns:
 *  r0, r3, r6, r7 corrupted
 *  r4 = physical page table address
 */
__create_page_tables:
	pgtbl	r4				@ page table address

	/*
	 * Clear the 16K level 1 swapper page table
	 */
	mov	r0, r4
	mov	r3, #0
	add	r6, r0, #0x4000
1:	str	r3, [r0], #4
	str	r3, [r0], #4
	str	r3, [r0], #4
	str	r3, [r0], #4
	teq	r0, r6
	bne	1b

	ldr	r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags

	/*
	 * Create identity mapping for first MB of kernel to
	 * cater for the MMU enable.  This identity mapping
	 * will be removed by paging_init().  We use our current program
	 * counter to determine corresponding section base address.
	 */
	mov	r6, pc
	mov	r6, r6, lsr #20			@ start of kernel section
	orr	r3, r7, r6, lsl #20		@ flags + kernel base
	str	r3, [r4, r6, lsl #2]		@ identity mapping

	/*
	 * Now setup the pagetables for our kernel direct
	 * mapped region.
	 */
	add	r0, r4,  #(KERNEL_START & 0xff000000) >> 18
	str	r3, [r0, #(KERNEL_START & 0x00f00000) >> 18]!
	ldr	r6, =(KERNEL_END - 1)
	add	r0, r0, #4
	add	r6, r4, r6, lsr #18
1:	cmp	r0, r6
	add	r3, r3, #1 << 20
	strls	r3, [r0], #4
	bls	1b

#ifdef CONFIG_XIP_KERNEL
	/*
	 * Map some ram to cover our .data and .bss areas.
	 */
	orr	r3, r7, #(KERNEL_RAM_PADDR & 0xff000000)
	.if	(KERNEL_RAM_PADDR & 0x00f00000)
	orr	r3, r3, #(KERNEL_RAM_PADDR & 0x00f00000)
	.endif
	add	r0, r4,  #(KERNEL_RAM_VADDR & 0xff000000) >> 18
	str	r3, [r0, #(KERNEL_RAM_VADDR & 0x00f00000) >> 18]!
	ldr	r6, =(_end - 1)
	add	r0, r0, #4
	add	r6, r4, r6, lsr #18
1:	cmp	r0, r6
	add	r3, r3, #1 << 20
	strls	r3, [r0], #4
	bls	1b
#endif

	/*
	 * Then map first 1MB of ram in case it contains our boot params.
	 */
	add	r0, r4, #PAGE_OFFSET >> 18
	orr	r6, r7, #(PHYS_OFFSET & 0xff000000)
	.if	(PHYS_OFFSET & 0x00f00000)
	orr	r6, r6, #(PHYS_OFFSET & 0x00f00000)
	.endif
	str	r6, [r0]

#ifdef CONFIG_DEBUG_LL
	ldr	r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
	/*
	 * Map in IO space for serial debugging.
	 * This allows debug messages to be output
	 * via a serial console before paging_init.
	 */
	ldr	r3, [r8, #MACHINFO_PGOFFIO]
	add	r0, r4, r3
	rsb	r3, r3, #0x4000			@ PTRS_PER_PGD*sizeof(long)
	cmp	r3, #0x0800			@ limit to 512MB
	movhi	r3, #0x0800
	add	r6, r0, r3
	ldr	r3, [r8, #MACHINFO_PHYSIO]
	orr	r3, r3, r7
1:	str	r3, [r0], #4
	add	r3, r3, #1 << 20
	teq	r0, r6
	bne	1b
#if defined(CONFIG_ARCH_NETWINDER) || defined(CONFIG_ARCH_CATS)
	/*
	 * If we're using the NetWinder or CATS, we also need to map
	 * in the 16550-type serial port for the debug messages
	 */
	add	r0, r4, #0xff000000 >> 18
	orr	r3, r7, #0x7c000000
	str	r3, [r0]
#endif
#ifdef CONFIG_ARCH_RPC
	/*
	 * Map in screen at 0x02000000 & SCREEN2_BASE
	 * Similar reasons here - for debug.  This is
	 * only for Acorn RiscPC architectures.
	 */
	add	r0, r4, #0x02000000 >> 18
	orr	r3, r7, #0x02000000
	str	r3, [r0]
	add	r0, r4, #0xd8000000 >> 18
	str	r3, [r0]
#endif
#endif
	mov	pc, lr
ENDPROC(__create_page_tables)
	.ltorg

#include "head-common.S"
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/kernel/head.S
	3	*
	4	* Copyright (C) 1994-2002 Russell King
e65f38ed RK	5	* Copyright (c) 2003 ARM Limited
e65f38ed RK	6	* All Rights Reserved
1da177e4 LT	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* Kernel startup code for all 32-bit CPUs
	13	*/
1da177e4 LT	14	#include <linux/linkage.h>
	15	#include <linux/init.h>
	16
	17	#include <asm/assembler.h>
	18	#include <asm/domain.h>
1da177e4	19	#include <asm/ptrace.h>
e6ae744d	20	#include <asm/asm-offsets.h>
f09b9979	21	#include <asm/memory.h>
4f7a1812	22	#include <asm/thread_info.h>
1da177e4 LT	23	#include <asm/system.h>
1da177e4 LT	24
d4e1c889 LW	25	#if (PHYS_OFFSET & 0x001fffff)
	26	#error "PHYS_OFFSET must be at an even 2MiB boundary!"
	27	#endif
	28
f06b97ff RK	29	#define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET)
f06b97ff RK	30	#define KERNEL_RAM_PADDR (PHYS_OFFSET + TEXT_OFFSET)
9d4f13e5	31
9d20fdd5	32
1da177e4	33	/*
37d07b72	34	* swapper_pg_dir is the virtual address of the initial page table.
f06b97ff RK	35	* We place the page tables 16K below KERNEL_RAM_VADDR. Therefore, we must
f06b97ff RK	36	* make sure that KERNEL_RAM_VADDR is correctly set. Currently, we expect
37d07b72	37	* the least significant 16 bits to be 0x8000, but we could probably
f06b97ff	38	* relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000.
1da177e4	39	*/
f06b97ff RK	40	#if (KERNEL_RAM_VADDR & 0xffff) != 0x8000
f06b97ff RK	41	#error KERNEL_RAM_VADDR must start at 0xXXXX8000
1da177e4 LT	42	#endif
	43
	44	.globl swapper_pg_dir
f06b97ff	45	.equ swapper_pg_dir, KERNEL_RAM_VADDR - 0x4000
1da177e4	46
37d07b72	47	.macro pgtbl, rd
f06b97ff	48	ldr \rd, =(KERNEL_RAM_PADDR - 0x4000)
1da177e4	49	.endm
1da177e4	50
37d07b72	51	#ifdef CONFIG_XIP_KERNEL
e98ff7f6 NP	52	#define KERNEL_START XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
e98ff7f6 NP	53	#define KERNEL_END _edata_loc
37d07b72	54	#else
e98ff7f6 NP	55	#define KERNEL_START KERNEL_RAM_VADDR
e98ff7f6 NP	56	#define KERNEL_END _end
1da177e4 LT	57	#endif
	58
	59	/*
	60	* Kernel startup entry point.
	61	* ---------------------------
	62	*
	63	* This is normally called from the decompressor code. The requirements
	64	* are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0,
9d20fdd5	65	* r1 = machine nr, r2 = atags pointer.
1da177e4 LT	66	*
	67	* This code is mostly position independent, so if you link the kernel at
	68	* 0xc0008000, you call this at __pa(0xc0008000).
	69	*
	70	* See linux/arch/arm/tools/mach-types for the complete list of machine
	71	* numbers for r1.
	72	*
	73	* We're trying to keep crap to a minimum; DO NOT add any machine specific
	74	* crap here - that's what the boot loader (or in extreme, well justified
	75	* circumstances, zImage) is for.
	76	*/
08fdffd4	77	.section ".text.head", "ax"
1da177e4	78	ENTRY(stext)
b86040a5	79	setmode PSR_F_BIT \| PSR_I_BIT \| SVC_MODE, r9 @ ensure svc mode
1da177e4	80	@ and irqs disabled
0f44ba1d	81	mrc p15, 0, r9, c0, c0 @ get processor id
1da177e4 LT	82	bl __lookup_processor_type @ r5=procinfo r9=cpuid
1da177e4 LT	83	movs r10, r5 @ invalid processor (r5=0)?
3c0bdac3	84	beq __error_p @ yes, error 'p'
1da177e4 LT	85	bl __lookup_machine_type @ r5=machinfo
	86	movs r8, r5 @ invalid machine (r5=0)?
	87	beq __error_a @ yes, error 'a'
9d20fdd5	88	bl __vet_atags
1da177e4 LT	89	bl __create_page_tables
	90
	91	/*
	92	* The following calls CPU specific code in a position independent
	93	* manner. See arch/arm/mm/proc-*.S for details. r10 = base of
	94	* xxx_proc_info structure selected by __lookup_machine_type
	95	* above. On return, the CPU will be ready for the MMU to be
	96	* turned on, and r0 will hold the CPU control register value.
	97	*/
	98	ldr r13, __switch_data @ address to jump to after
	99	@ mmu has been enabled
b86040a5 CM	100	adr lr, BSYM(__enable_mmu) @ return (PIC) address
	101	ARM( add pc, r10, #PROCINFO_INITFUNC )
	102	THUMB( add r12, r10, #PROCINFO_INITFUNC )
	103	THUMB( mov pc, r12 )
93ed3970	104	ENDPROC(stext)
1da177e4	105
e65f38ed	106	#if defined(CONFIG_SMP)
e65f38ed RK	107	ENTRY(secondary_startup)
	108	/*
	109	* Common entry point for secondary CPUs.
	110	*
	111	* Ensure that we're in SVC mode, and IRQs are disabled. Lookup
	112	* the processor type - there is no need to check the machine type
	113	* as it has already been validated by the primary processor.
	114	*/
b86040a5	115	setmode PSR_F_BIT \| PSR_I_BIT \| SVC_MODE, r9
0f44ba1d	116	mrc p15, 0, r9, c0, c0 @ get processor id
e65f38ed RK	117	bl __lookup_processor_type
	118	movs r10, r5 @ invalid processor?
	119	moveq r0, #'p' @ yes, error 'p'
	120	beq __error
	121
	122	/*
	123	* Use the page tables supplied from __cpu_up.
	124	*/
	125	adr r4, __secondary_data
b86040a5	126	ldmia r4, {r5, r7, r12} @ address to jump to after
e65f38ed	127	sub r4, r4, r5 @ mmu has been enabled
34d92626	128	ldr r4, [r7, r4] @ get secondary_data.pgdir
b86040a5 CM	129	adr lr, BSYM(__enable_mmu) @ return address
	130	mov r13, r12 @ __secondary_switched address
	131	ARM( add pc, r10, #PROCINFO_INITFUNC ) @ initialise processor
	132	@ (return control reg)
	133	THUMB( add r12, r10, #PROCINFO_INITFUNC )
	134	THUMB( mov pc, r12 )
93ed3970	135	ENDPROC(secondary_startup)
e65f38ed RK	136
	137	/*
	138	* r6 = &secondary_data
	139	*/
	140	ENTRY(__secondary_switched)
34d92626	141	ldr sp, [r7, #4] @ get secondary_data.stack
e65f38ed RK	142	mov fp, #0
e65f38ed RK	143	b secondary_start_kernel
93ed3970	144	ENDPROC(__secondary_switched)
e65f38ed RK	145
	146	.type __secondary_data, %object
	147	__secondary_data:
	148	.long .
	149	.long secondary_data
	150	.long __secondary_switched
	151	#endif /* defined(CONFIG_SMP) */
	152
1da177e4 LT	153
	154
	155	/*
	156	* Setup common bits before finally enabling the MMU. Essentially
	157	* this is just loading the page table pointer and domain access
	158	* registers.
	159	*/
1da177e4 LT	160	__enable_mmu:
	161	#ifdef CONFIG_ALIGNMENT_TRAP
	162	orr r0, r0, #CR_A
	163	#else
	164	bic r0, r0, #CR_A
	165	#endif
	166	#ifdef CONFIG_CPU_DCACHE_DISABLE
	167	bic r0, r0, #CR_C
	168	#endif
	169	#ifdef CONFIG_CPU_BPREDICT_DISABLE
	170	bic r0, r0, #CR_Z
	171	#endif
	172	#ifdef CONFIG_CPU_ICACHE_DISABLE
	173	bic r0, r0, #CR_I
	174	#endif
	175	mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) \| \
	176	domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) \| \
	177	domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) \| \
	178	domain_val(DOMAIN_IO, DOMAIN_CLIENT))
	179	mcr p15, 0, r5, c3, c0, 0 @ load domain access register
	180	mcr p15, 0, r4, c2, c0, 0 @ load page table pointer
	181	b __turn_mmu_on
93ed3970	182	ENDPROC(__enable_mmu)
1da177e4 LT	183
	184	/*
	185	* Enable the MMU. This completely changes the structure of the visible
	186	* memory space. You will not be able to trace execution through this.
	187	* If you have an enquiry about this, please check the linux-arm-kernel
	188	* mailing list archives BEFORE sending another post to the list.
	189	*
	190	* r0 = cp#15 control register
	191	* r13 = virtual address to jump to upon completion
	192	*
	193	* other registers depend on the function called upon completion
	194	*/
	195	.align 5
1da177e4 LT	196	__turn_mmu_on:
	197	mov r0, r0
	198	mcr p15, 0, r0, c1, c0, 0 @ write control reg
	199	mrc p15, 0, r3, c0, c0, 0 @ read id reg
	200	mov r3, r3
b86040a5 CM	201	mov r3, r13
b86040a5 CM	202	mov pc, r3
93ed3970	203	ENDPROC(__turn_mmu_on)
1da177e4 LT	204
	205
	206	/*
	207	* Setup the initial page tables. We only setup the barest
	208	* amount which are required to get the kernel running, which
	209	* generally means mapping in the kernel code.
	210	*
	211	* r8 = machinfo
	212	* r9 = cpuid
	213	* r10 = procinfo
	214	*
	215	* Returns:
2df96b34	216	* r0, r3, r6, r7 corrupted
1da177e4 LT	217	* r4 = physical page table address
1da177e4 LT	218	*/
1da177e4	219	__create_page_tables:
37d07b72	220	pgtbl r4 @ page table address
1da177e4 LT	221
	222	/*
	223	* Clear the 16K level 1 swapper page table
	224	*/
	225	mov r0, r4
	226	mov r3, #0
	227	add r6, r0, #0x4000
	228	1: str r3, [r0], #4
	229	str r3, [r0], #4
	230	str r3, [r0], #4
	231	str r3, [r0], #4
	232	teq r0, r6
	233	bne 1b
	234
8799ee9f	235	ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags
1da177e4 LT	236
	237	/*
	238	* Create identity mapping for first MB of kernel to
	239	* cater for the MMU enable. This identity mapping
	240	* will be removed by paging_init(). We use our current program
	241	* counter to determine corresponding section base address.
	242	*/
b86040a5 CM	243	mov r6, pc
b86040a5 CM	244	mov r6, r6, lsr #20 @ start of kernel section
1da177e4 LT	245	orr r3, r7, r6, lsl #20 @ flags + kernel base
	246	str r3, [r4, r6, lsl #2] @ identity mapping
	247
	248	/*
	249	* Now setup the pagetables for our kernel direct
2552fc27	250	* mapped region.
1da177e4	251	*/
e98ff7f6 NP	252	add r0, r4, #(KERNEL_START & 0xff000000) >> 18
	253	str r3, [r0, #(KERNEL_START & 0x00f00000) >> 18]!
	254	ldr r6, =(KERNEL_END - 1)
	255	add r0, r0, #4
	256	add r6, r4, r6, lsr #18
	257	1: cmp r0, r6
	258	add r3, r3, #1 << 20
	259	strls r3, [r0], #4
	260	bls 1b
1da177e4	261
ec3622d9 NP	262	#ifdef CONFIG_XIP_KERNEL
	263	/*
	264	* Map some ram to cover our .data and .bss areas.
	265	*/
	266	orr r3, r7, #(KERNEL_RAM_PADDR & 0xff000000)
40435792	267	.if (KERNEL_RAM_PADDR & 0x00f00000)
ec3622d9	268	orr r3, r3, #(KERNEL_RAM_PADDR & 0x00f00000)
40435792	269	.endif
ec3622d9 NP	270	add r0, r4, #(KERNEL_RAM_VADDR & 0xff000000) >> 18
	271	str r3, [r0, #(KERNEL_RAM_VADDR & 0x00f00000) >> 18]!
	272	ldr r6, =(_end - 1)
	273	add r0, r0, #4
	274	add r6, r4, r6, lsr #18
	275	1: cmp r0, r6
	276	add r3, r3, #1 << 20
	277	strls r3, [r0], #4
	278	bls 1b
	279	#endif
	280
1da177e4 LT	281	/*
	282	* Then map first 1MB of ram in case it contains our boot params.
	283	*/
f09b9979	284	add r0, r4, #PAGE_OFFSET >> 18
d4e1c889	285	orr r6, r7, #(PHYS_OFFSET & 0xff000000)
40435792 NP	286	.if (PHYS_OFFSET & 0x00f00000)
	287	orr r6, r6, #(PHYS_OFFSET & 0x00f00000)
	288	.endif
1da177e4 LT	289	str r6, [r0]
1da177e4 LT	290
c77b0427	291	#ifdef CONFIG_DEBUG_LL
8799ee9f	292	ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags
1da177e4 LT	293	/*
	294	* Map in IO space for serial debugging.
	295	* This allows debug messages to be output
	296	* via a serial console before paging_init.
	297	*/
	298	ldr r3, [r8, #MACHINFO_PGOFFIO]
	299	add r0, r4, r3
	300	rsb r3, r3, #0x4000 @ PTRS_PER_PGD*sizeof(long)
	301	cmp r3, #0x0800 @ limit to 512MB
	302	movhi r3, #0x0800
	303	add r6, r0, r3
	304	ldr r3, [r8, #MACHINFO_PHYSIO]
	305	orr r3, r3, r7
	306	1: str r3, [r0], #4
	307	add r3, r3, #1 << 20
	308	teq r0, r6
	309	bne 1b
	310	#if defined(CONFIG_ARCH_NETWINDER) \|\| defined(CONFIG_ARCH_CATS)
	311	/*
3c0bdac3 RK	312	* If we're using the NetWinder or CATS, we also need to map
3c0bdac3 RK	313	* in the 16550-type serial port for the debug messages
1da177e4	314	*/
c77b0427 RK	315	add r0, r4, #0xff000000 >> 18
	316	orr r3, r7, #0x7c000000
	317	str r3, [r0]
1da177e4	318	#endif
1da177e4 LT	319	#ifdef CONFIG_ARCH_RPC
	320	/*
	321	* Map in screen at 0x02000000 & SCREEN2_BASE
	322	* Similar reasons here - for debug. This is
	323	* only for Acorn RiscPC architectures.
	324	*/
c77b0427 RK	325	add r0, r4, #0x02000000 >> 18
c77b0427 RK	326	orr r3, r7, #0x02000000
1da177e4	327	str r3, [r0]
c77b0427	328	add r0, r4, #0xd8000000 >> 18
1da177e4	329	str r3, [r0]
c77b0427	330	#endif
1da177e4 LT	331	#endif
1da177e4 LT	332	mov pc, lr
93ed3970	333	ENDPROC(__create_page_tables)
1da177e4 LT	334	.ltorg
1da177e4 LT	335
75d90832	336	#include "head-common.S"