| Hyok S. Choi | 75d9083 | 2006-03-27 14:58:25 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/head-nommu.S |
| 3 | * |
| 4 | * Copyright (C) 1994-2002 Russell King |
| 5 | * Copyright (C) 2003-2006 Hyok S. Choi |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * Common kernel startup code (non-paged MM) |
| 12 | * for 32-bit CPUs which has a process ID register(CP15). |
| 13 | * |
| 14 | */ |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/linkage.h> |
| 17 | #include <linux/init.h> |
| 18 | |
| 19 | #include <asm/assembler.h> |
| 20 | #include <asm/mach-types.h> |
| 21 | #include <asm/procinfo.h> |
| 22 | #include <asm/ptrace.h> |
| Uwe Zeisberger | 2eb9d31 | 2006-05-05 15:11:14 +0100 | [diff] [blame^] | 23 | #include <asm/asm-offsets.h> |
| Hyok S. Choi | 3b920ce | 2006-04-24 09:45:35 +0100 | [diff] [blame] | 24 | #include <asm/thread_info.h> |
| Hyok S. Choi | 75d9083 | 2006-03-27 14:58:25 +0100 | [diff] [blame] | 25 | #include <asm/system.h> |
| 26 | |
| Hyok S. Choi | 75d9083 | 2006-03-27 14:58:25 +0100 | [diff] [blame] | 27 | /* |
| 28 | * Kernel startup entry point. |
| 29 | * --------------------------- |
| 30 | * |
| 31 | * This is normally called from the decompressor code. The requirements |
| 32 | * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0, |
| 33 | * r1 = machine nr. |
| 34 | * |
| 35 | * See linux/arch/arm/tools/mach-types for the complete list of machine |
| 36 | * numbers for r1. |
| 37 | * |
| 38 | */ |
| 39 | __INIT |
| 40 | .type stext, %function |
| 41 | ENTRY(stext) |
| 42 | msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | MODE_SVC @ ensure svc mode |
| 43 | @ and irqs disabled |
| 44 | mrc p15, 0, r9, c0, c0 @ get processor id |
| 45 | bl __lookup_processor_type @ r5=procinfo r9=cpuid |
| 46 | movs r10, r5 @ invalid processor (r5=0)? |
| 47 | beq __error_p @ yes, error 'p' |
| 48 | bl __lookup_machine_type @ r5=machinfo |
| 49 | movs r8, r5 @ invalid machine (r5=0)? |
| 50 | beq __error_a @ yes, error 'a' |
| 51 | |
| 52 | ldr r13, __switch_data @ address to jump to after |
| 53 | @ the initialization is done |
| 54 | adr lr, __after_proc_init @ return (PIC) address |
| 55 | add pc, r10, #PROCINFO_INITFUNC |
| 56 | |
| 57 | /* |
| 58 | * Set the Control Register and Read the process ID. |
| 59 | */ |
| 60 | .type __after_proc_init, %function |
| 61 | __after_proc_init: |
| 62 | mrc p15, 0, r0, c1, c0, 0 @ read control reg |
| 63 | #ifdef CONFIG_ALIGNMENT_TRAP |
| 64 | orr r0, r0, #CR_A |
| 65 | #else |
| 66 | bic r0, r0, #CR_A |
| 67 | #endif |
| 68 | #ifdef CONFIG_CPU_DCACHE_DISABLE |
| 69 | bic r0, r0, #CR_C |
| 70 | #endif |
| 71 | #ifdef CONFIG_CPU_BPREDICT_DISABLE |
| 72 | bic r0, r0, #CR_Z |
| 73 | #endif |
| 74 | #ifdef CONFIG_CPU_ICACHE_DISABLE |
| 75 | bic r0, r0, #CR_I |
| 76 | #endif |
| 77 | mcr p15, 0, r0, c1, c0, 0 @ write control reg |
| 78 | |
| 79 | mov pc, r13 @ clear the BSS and jump |
| 80 | @ to start_kernel |
| Hyok S. Choi | 3b920ce | 2006-04-24 09:45:35 +0100 | [diff] [blame] | 81 | .ltorg |
| Hyok S. Choi | 75d9083 | 2006-03-27 14:58:25 +0100 | [diff] [blame] | 82 | |
| 83 | #include "head-common.S" |