X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Farm%2Fkernel%2Fhead.S;h=cf495a3084b31f8a7ead7089508ff16096864ae9;hb=refs%2Fheads%2Fvserver;hp=1aca1775b28f188ac6682e5dfd15cd54e05b414e;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 1aca1775b..cf495a308 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -11,52 +11,46 @@ * * Kernel startup code for all 32-bit CPUs */ -#include #include #include #include #include -#include #include #include #include #include #include -#define PROCINFO_MMUFLAGS 8 -#define PROCINFO_INITFUNC 12 - -#define MACHINFO_TYPE 0 -#define MACHINFO_PHYSRAM 4 -#define MACHINFO_PHYSIO 8 -#define MACHINFO_PGOFFIO 12 -#define MACHINFO_NAME 16 +#if (PHYS_OFFSET & 0x001fffff) +#error "PHYS_OFFSET must be at an even 2MiB boundary!" +#endif -#define KERNEL_RAM_ADDR (PAGE_OFFSET + TEXT_OFFSET) +#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_ADDR. Therefore, we must - * make sure that KERNEL_RAM_ADDR is correctly set. Currently, we expect + * 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_ADDR >= PAGE_OFFSET + 0x4000. + * relax this restriction to KERNEL_RAM_VADDR >= PAGE_OFFSET + 0x4000. */ -#if (KERNEL_RAM_ADDR & 0xffff) != 0x8000 -#error KERNEL_RAM_ADDR must start at 0xXXXX8000 +#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_ADDR - 0x4000 + .equ swapper_pg_dir, KERNEL_RAM_VADDR - 0x4000 .macro pgtbl, rd - ldr \rd, =(__virt_to_phys(KERNEL_RAM_ADDR - 0x4000)) + ldr \rd, =(KERNEL_RAM_PADDR - 0x4000) .endm #ifdef CONFIG_XIP_KERNEL #define TEXTADDR XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) #else -#define TEXTADDR KERNEL_RAM_ADDR +#define TEXTADDR KERNEL_RAM_VADDR #endif /* @@ -80,8 +74,9 @@ __INIT .type stext, %function ENTRY(stext) - msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | MODE_SVC @ ensure svc mode + msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE @ 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' @@ -102,49 +97,6 @@ ENTRY(stext) adr lr, __enable_mmu @ return (PIC) address add pc, r10, #PROCINFO_INITFUNC - .type __switch_data, %object -__switch_data: - .long __mmap_switched - .long __data_loc @ r4 - .long __data_start @ r5 - .long __bss_start @ r6 - .long _end @ r7 - .long processor_id @ r4 - .long __machine_arch_type @ r5 - .long cr_alignment @ r6 - .long init_thread_union + THREAD_START_SP @ sp - -/* - * The following fragment of code is executed with the MMU on, and uses - * absolute addresses; this is not position independent. - * - * r0 = cp#15 control register - * r1 = machine ID - * r9 = processor ID - */ - .type __mmap_switched, %function -__mmap_switched: - adr r3, __switch_data + 4 - - 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 - - ldmia r3, {r4, r5, r6, sp} - str r9, [r4] @ Save processor ID - str r1, [r5] @ Save machine type - bic r4, r0, #CR_A @ Clear 'A' bit - stmia r6, {r0, r4} @ Save control register values - b start_kernel - #if defined(CONFIG_SMP) .type secondary_startup, #function ENTRY(secondary_startup) @@ -155,7 +107,8 @@ ENTRY(secondary_startup) * the processor type - there is no need to check the machine type * as it has already been validated by the primary processor. */ - msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | MODE_SVC + msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE + mrc p15, 0, r9, c0, c0 @ get processor id bl __lookup_processor_type movs r10, r5 @ invalid processor? moveq r0, #'p' @ yes, error 'p' @@ -165,18 +118,18 @@ ENTRY(secondary_startup) * Use the page tables supplied from __cpu_up. */ adr r4, __secondary_data - ldmia r4, {r5, r6, r13} @ address to jump to after + ldmia r4, {r5, r7, r13} @ address to jump to after sub r4, r4, r5 @ mmu has been enabled - ldr r4, [r6, r4] @ get secondary_data.pgdir + ldr r4, [r7, r4] @ get secondary_data.pgdir adr lr, __enable_mmu @ return address - add pc, r10, #12 @ initialise processor + add pc, r10, #PROCINFO_INITFUNC @ initialise processor @ (return control reg) /* * r6 = &secondary_data */ ENTRY(__secondary_switched) - ldr sp, [r6, #4] @ get secondary_data.stack + ldr sp, [r7, #4] @ get secondary_data.stack mov fp, #0 b secondary_start_kernel @@ -271,7 +224,7 @@ __create_page_tables: teq r0, r6 bne 1b - ldr r7, [r10, #PROCINFO_MMUFLAGS] @ mmuflags + ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags /* * Create identity mapping for first MB of kernel to @@ -285,24 +238,25 @@ __create_page_tables: /* * Now setup the pagetables for our kernel direct - * mapped region. We round TEXTADDR down to the - * nearest megabyte boundary. It is assumed that - * the kernel fits within 4 contigous 1MB sections. + * mapped region. */ add r0, r4, #(TEXTADDR & 0xff000000) >> 18 @ start of kernel str r3, [r0, #(TEXTADDR & 0x00f00000) >> 18]! - add r3, r3, #1 << 20 - str r3, [r0, #4]! @ KERNEL + 1MB - add r3, r3, #1 << 20 - str r3, [r0, #4]! @ KERNEL + 2MB - add r3, r3, #1 << 20 - str r3, [r0, #4] @ KERNEL + 3MB + + ldr r6, =(_end - PAGE_OFFSET - 1) @ r6 = number of sections + mov r6, r6, lsr #20 @ needed for kernel minus 1 + +1: add r3, r3, #1 << 20 + str r3, [r0, #4]! + subs r6, r6, #1 + bgt 1b /* * Then map first 1MB of ram in case it contains our boot params. */ add r0, r4, #PAGE_OFFSET >> 18 - orr r6, r7, #PHYS_OFFSET + orr r6, r7, #(PHYS_OFFSET & 0xff000000) + orr r6, r6, #(PHYS_OFFSET & 0x00e00000) str r6, [r0] #ifdef CONFIG_XIP_KERNEL @@ -322,8 +276,7 @@ __create_page_tables: #endif #ifdef CONFIG_DEBUG_LL - bic r7, r7, #0x0c @ turn off cacheable - @ and bufferable bits + ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags /* * Map in IO space for serial debugging. * This allows debug messages to be output @@ -366,165 +319,4 @@ __create_page_tables: mov pc, lr .ltorg - - -/* - * 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). - */ - - .type __error_p, %function -__error_p: -#ifdef CONFIG_DEBUG_LL - adr r0, str_p1 - bl printascii - b __error -str_p1: .asciz "\nError: unrecognized/unsupported processor variant.\n" - .align -#endif - - .type __error_a, %function -__error_a: -#ifdef CONFIG_DEBUG_LL - mov r4, r1 @ preserve machine ID - adr r0, str_a1 - bl printascii - mov r0, r4 - bl printhex8 - adr r0, str_a2 - bl printascii - adr r3, 3f - ldmia r3, {r4, r5, r6} @ get machine desc list - sub r4, r3, r4 @ get offset between virt&phys - add r5, r5, r4 @ convert virt addresses to - add r6, r6, r4 @ physical address space -1: ldr r0, [r5, #MACHINFO_TYPE] @ get machine type - bl printhex8 - mov r0, #'\t' - bl printch - ldr r0, [r5, #MACHINFO_NAME] @ get machine name - add r0, r0, r4 - bl printascii - mov r0, #'\n' - bl printch - add r5, r5, #SIZEOF_MACHINE_DESC @ next machine_desc - cmp r5, r6 - blo 1b - adr r0, str_a3 - bl printascii - b __error -str_a1: .asciz "\nError: unrecognized/unsupported machine ID (r1 = 0x" -str_a2: .asciz ").\n\nAvailable machine support:\n\nID (hex)\tNAME\n" -str_a3: .asciz "\nPlease check your kernel config and/or bootloader.\n" - .align -#endif - - .type __error, %function -__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 - - -/* - * 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. - * - * Returns: - * r3, r4, r6 corrupted - * r5 = proc_info pointer in physical address space - * r9 = cpuid - */ - .type __lookup_processor_type, %function -__lookup_processor_type: - adr r3, 3f - ldmda r3, {r5, r6, r9} - sub r3, r3, r9 @ get offset between virt&phys - add r5, r5, r3 @ convert virt addresses to - add r6, r6, r3 @ physical address space - mrc p15, 0, r9, c0, c0 @ get processor id -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 - -/* - * This provides a C-API version of the above function. - */ -ENTRY(lookup_processor_type) - stmfd sp!, {r4 - r6, r9, lr} - bl __lookup_processor_type - mov r0, r5 - ldmfd sp!, {r4 - r6, r9, pc} - -/* - * Look in include/asm-arm/procinfo.h and arch/arm/kernel/arch.[ch] for - * more information about the __proc_info and __arch_info structures. - */ - .long __proc_info_begin - .long __proc_info_end -3: .long . - .long __arch_info_begin - .long __arch_info_end - -/* - * Lookup machine architecture in the linker-build list of architectures. - * Note that we can't use the absolute addresses for the __arch_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. - * - * r1 = machine architecture number - * Returns: - * r3, r4, r6 corrupted - * r5 = mach_info pointer in physical address space - */ - .type __lookup_machine_type, %function -__lookup_machine_type: - adr r3, 3b - ldmia r3, {r4, r5, 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: ldr r3, [r5, #MACHINFO_TYPE] @ get machine type - teq r3, r1 @ matches loader number? - beq 2f @ found - add r5, r5, #SIZEOF_MACHINE_DESC @ next machine_desc - cmp r5, r6 - blo 1b - mov r5, #0 @ unknown machine -2: mov pc, lr - -/* - * This provides a C-API version of the above function. - */ -ENTRY(lookup_machine_type) - stmfd sp!, {r4 - r6, lr} - mov r1, r0 - bl __lookup_machine_type - mov r0, r5 - ldmfd sp!, {r4 - r6, pc} +#include "head-common.S"