diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/kernel/head-common.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/kernel/head-common.S | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/ANDROID_3.4.5/arch/arm/kernel/head-common.S b/ANDROID_3.4.5/arch/arm/kernel/head-common.S deleted file mode 100644 index 854bd223..00000000 --- a/ANDROID_3.4.5/arch/arm/kernel/head-common.S +++ /dev/null @@ -1,204 +0,0 @@ -/* - * linux/arch/arm/kernel/head-common.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. - * - */ - -#define ATAG_CORE 0x54410001 -#define ATAG_CORE_SIZE ((2*4 + 3*4) >> 2) -#define ATAG_CORE_SIZE_EMPTY ((2*4) >> 2) - -#ifdef CONFIG_CPU_BIG_ENDIAN -#define OF_DT_MAGIC 0xd00dfeed -#else -#define OF_DT_MAGIC 0xedfe0dd0 /* 0xd00dfeed in big-endian */ -#endif - -/* - * Exception handling. Something went wrong and we can't proceed. We - * ought to tell the user, but since we don't have any guarantee that - * we're even running on the right architecture, we do virtually nothing. - * - * If CONFIG_DEBUG_LL is set we try to print out something about the error - * and hope for the best (useful if bootloader fails to pass a proper - * machine ID for example). - */ - __HEAD - -/* Determine validity of the r2 atags pointer. The heuristic requires - * that the pointer be aligned, in the first 16k of physical RAM and - * that the ATAG_CORE marker is first and present. If CONFIG_OF_FLATTREE - * is selected, then it will also accept a dtb pointer. Future revisions - * of this function may be more lenient with the physical address and - * may also be able to move the ATAGS block if necessary. - * - * Returns: - * r2 either valid atags pointer, valid dtb pointer, or zero - * r5, r6 corrupted - */ -__vet_atags: - tst r2, #0x3 @ aligned? - bne 1f - - ldr r5, [r2, #0] -#ifdef CONFIG_OF_FLATTREE - ldr r6, =OF_DT_MAGIC @ is it a DTB? - cmp r5, r6 - beq 2f -#endif - cmp r5, #ATAG_CORE_SIZE @ is first tag ATAG_CORE? - cmpne r5, #ATAG_CORE_SIZE_EMPTY - bne 1f - ldr r5, [r2, #4] - ldr r6, =ATAG_CORE - cmp r5, r6 - bne 1f - -2: mov pc, lr @ atag/dtb pointer is ok - -1: mov r2, #0 - mov pc, lr -ENDPROC(__vet_atags) - -/* - * The following fragment of code is executed with the MMU on in MMU mode, - * and uses absolute addresses; this is not position independent. - * - * r0 = cp#15 control register - * r1 = machine ID - * r2 = atags/dtb pointer - * r9 = processor ID - */ - __INIT -__mmap_switched: - adr r3, __mmap_switched_data - - ldmia r3!, {r4, r5, r6, r7} - cmp r4, r5 @ Copy data segment if needed -1: cmpne r5, r6 - ldrne fp, [r4], #4 - strne fp, [r5], #4 - bne 1b - - mov fp, #0 @ Clear BSS (and zero fp) -1: cmp r6, r7 - strcc fp, [r6],#4 - bcc 1b - - ARM( ldmia r3, {r4, r5, r6, r7, sp}) - THUMB( ldmia r3, {r4, r5, r6, r7} ) - THUMB( ldr sp, [r3, #16] ) - str r9, [r4] @ Save processor ID - str r1, [r5] @ Save machine type - str r2, [r6] @ Save atags pointer - bic r4, r0, #CR_A @ Clear 'A' bit - stmia r7, {r0, r4} @ Save control register values - b start_kernel -ENDPROC(__mmap_switched) - - .align 2 - .type __mmap_switched_data, %object -__mmap_switched_data: - .long __data_loc @ r4 - .long _sdata @ r5 - .long __bss_start @ r6 - .long _end @ r7 - .long processor_id @ r4 - .long __machine_arch_type @ r5 - .long __atags_pointer @ r6 - .long cr_alignment @ r7 - .long init_thread_union + THREAD_START_SP @ sp - .size __mmap_switched_data, . - __mmap_switched_data - -/* - * This provides a C-API version of __lookup_processor_type - */ -ENTRY(lookup_processor_type) - stmfd sp!, {r4 - r6, r9, lr} - mov r9, r0 - bl __lookup_processor_type - mov r0, r5 - ldmfd sp!, {r4 - r6, r9, pc} -ENDPROC(lookup_processor_type) - -/* - * Read processor ID register (CP#15, CR0), and look up in the linker-built - * supported processor list. Note that we can't use the absolute addresses - * for the __proc_info lists since we aren't running with the MMU on - * (and therefore, we are not in the correct address space). We have to - * calculate the offset. - * - * r9 = cpuid - * Returns: - * r3, r4, r6 corrupted - * r5 = proc_info pointer in physical address space - * r9 = cpuid (preserved) - */ - __CPUINIT -__lookup_processor_type: - adr r3, __lookup_processor_type_data - ldmia r3, {r4 - r6} - sub r3, r3, r4 @ get offset between virt&phys - add r5, r5, r3 @ convert virt addresses to - add r6, r6, r3 @ physical address space -1: ldmia r5, {r3, r4} @ value, mask - and r4, r4, r9 @ mask wanted bits - teq r3, r4 - beq 2f - add r5, r5, #PROC_INFO_SZ @ sizeof(proc_info_list) - cmp r5, r6 - blo 1b - mov r5, #0 @ unknown processor -2: mov pc, lr -ENDPROC(__lookup_processor_type) - -/* - * Look in <asm/procinfo.h> for information about the __proc_info structure. - */ - .align 2 - .type __lookup_processor_type_data, %object -__lookup_processor_type_data: - .long . - .long __proc_info_begin - .long __proc_info_end - .size __lookup_processor_type_data, . - __lookup_processor_type_data - -__error_p: -#ifdef CONFIG_DEBUG_LL - adr r0, str_p1 - bl printascii - mov r0, r9 - bl printhex8 - adr r0, str_p2 - bl printascii - b __error -str_p1: .asciz "\nError: unrecognized/unsupported processor variant (0x" -str_p2: .asciz ").\n" - .align -#endif -ENDPROC(__error_p) - -__error: -#ifdef CONFIG_ARCH_RPC -/* - * Turn the screen red on a error - RiscPC only. - */ - mov r0, #0x02000000 - mov r3, #0x11 - orr r3, r3, r3, lsl #8 - orr r3, r3, r3, lsl #16 - str r3, [r0], #4 - str r3, [r0], #4 - str r3, [r0], #4 - str r3, [r0], #4 -#endif -1: mov r0, r0 - b 1b -ENDPROC(__error) |