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Diffstat (limited to 'arch/cris/arch-v32/kernel/head.S')
| -rw-r--r-- | arch/cris/arch-v32/kernel/head.S | 439 |
1 files changed, 0 insertions, 439 deletions
diff --git a/arch/cris/arch-v32/kernel/head.S b/arch/cris/arch-v32/kernel/head.S deleted file mode 100644 index 92f9fb1f6845..000000000000 --- a/arch/cris/arch-v32/kernel/head.S +++ /dev/null @@ -1,439 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * CRISv32 kernel startup code. - * - * Copyright (C) 2003, Axis Communications AB - */ - -#include <linux/init.h> - -#define ASSEMBLER_MACROS_ONLY - -/* - * The macros found in mmu_defs_asm.h uses the ## concatenation operator, so - * -traditional must not be used when assembling this file. - */ -#include <arch/memmap.h> -#include <hwregs/reg_rdwr.h> -#include <hwregs/intr_vect.h> -#include <hwregs/asm/mmu_defs_asm.h> -#include <hwregs/asm/reg_map_asm.h> -#include <mach/startup.inc> - -#define CRAMFS_MAGIC 0x28cd3d45 -#define JHEAD_MAGIC 0x1FF528A6 -#define JHEAD_SIZE 8 -#define RAM_INIT_MAGIC 0x56902387 -#define COMMAND_LINE_MAGIC 0x87109563 -#define NAND_BOOT_MAGIC 0x9a9db001 - - ;; NOTE: R8 and R9 carry information from the decompressor (if the - ;; kernel was compressed). They must not be used in the code below - ;; until they are read! - - ;; Exported symbols. - .global etrax_irv - .global romfs_start - .global romfs_length - .global romfs_in_flash - .global nand_boot - .global swapper_pg_dir - - __HEAD -tstart: - ;; This is the entry point of the kernel. The CPU is currently in - ;; supervisor mode. - ;; - ;; 0x00000000 if flash. - ;; 0x40004000 if DRAM. - ;; - di - - START_CLOCKS - - SETUP_WAIT_STATES - - GIO_INIT - - ;; Setup and enable the MMU. Use same configuration for both the data - ;; and the instruction MMU. - ;; - ;; Note; 3 cycles is needed for a bank-select to take effect. Further; - ;; bank 1 is the instruction MMU, bank 2 is the data MMU. - -#ifdef CONFIG_CRIS_MACH_ARTPEC3 - move.d REG_FIELD(mmu, rw_mm_kbase_hi, base_e, 8) \ - | REG_FIELD(mmu, rw_mm_kbase_hi, base_c, 4) \ - | REG_FIELD(mmu, rw_mm_kbase_hi, base_d, 5) \ - | REG_FIELD(mmu, rw_mm_kbase_hi, base_b, 0xb), $r0 -#else - move.d REG_FIELD(mmu, rw_mm_kbase_hi, base_e, 8) \ - | REG_FIELD(mmu, rw_mm_kbase_hi, base_c, 4) \ - | REG_FIELD(mmu, rw_mm_kbase_hi, base_b, 0xb), $r0 -#endif - - ;; Temporary map of 0x40 -> 0x40 and 0x00 -> 0x00. - move.d REG_FIELD(mmu, rw_mm_kbase_lo, base_4, 4) \ - | REG_FIELD(mmu, rw_mm_kbase_lo, base_0, 0), $r1 - - ;; Enable certain page protections and setup linear mapping - ;; for f,e,c,b,4,0. - - ;; ARTPEC-3: - ;; c,d used for linear kernel mapping, up to 512 MB - ;; e used for vmalloc - ;; f unused, but page mapped to get page faults - - ;; ETRAX FS: - ;; c used for linear kernel mapping, up to 256 MB - ;; d used for vmalloc - ;; e,f used for memory-mapped NOR flash - -#ifdef CONFIG_CRIS_MACH_ARTPEC3 - move.d REG_STATE(mmu, rw_mm_cfg, we, on) \ - | REG_STATE(mmu, rw_mm_cfg, acc, on) \ - | REG_STATE(mmu, rw_mm_cfg, ex, on) \ - | REG_STATE(mmu, rw_mm_cfg, inv, on) \ - | REG_STATE(mmu, rw_mm_cfg, seg_f, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_e, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_d, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_c, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_b, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_a, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_9, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_8, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_7, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_6, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_5, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_4, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_3, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_2, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_1, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_0, linear), $r2 -#else - move.d REG_STATE(mmu, rw_mm_cfg, we, on) \ - | REG_STATE(mmu, rw_mm_cfg, acc, on) \ - | REG_STATE(mmu, rw_mm_cfg, ex, on) \ - | REG_STATE(mmu, rw_mm_cfg, inv, on) \ - | REG_STATE(mmu, rw_mm_cfg, seg_f, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_e, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_d, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_c, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_b, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_a, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_9, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_8, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_7, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_6, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_5, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_4, linear) \ - | REG_STATE(mmu, rw_mm_cfg, seg_3, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_2, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_1, page) \ - | REG_STATE(mmu, rw_mm_cfg, seg_0, linear), $r2 -#endif - - ;; Update instruction MMU. - move 1, $srs - nop - nop - nop - move $r0, $s2 ; kbase_hi. - move $r1, $s1 ; kbase_lo. - move $r2, $s0 ; mm_cfg, virtual memory configuration. - - ;; Update data MMU. - move 2, $srs - nop - nop - nop - move $r0, $s2 ; kbase_hi. - move $r1, $s1 ; kbase_lo - move $r2, $s0 ; mm_cfg, virtual memory configuration. - - ;; Enable data and instruction MMU. - move 0, $srs - moveq 0xf, $r0 ; IMMU, DMMU, DCache, Icache on - nop - nop - nop - move $r0, $s0 - nop - nop - nop - - ; Check if starting from DRAM (network->RAM boot or unpacked - ; compressed kernel), or directly from flash. - lapcq ., $r0 - and.d 0x7fffffff, $r0 ; Mask off the non-cache bit. - cmp.d 0x10000, $r0 ; Arbitrary, something above this code. - blo _inflash0 - nop - - jump _inram ; Jump to cached RAM. - nop - - ;; Jumpgate. -_inflash0: - jump _inflash - nop - - ;; Put the following in a section so that storage for it can be - ;; reclaimed after init is finished. - __INIT - -_inflash: - - ;; Initialize DRAM. - cmp.d RAM_INIT_MAGIC, $r8 ; Already initialized? - beq _dram_initialized - nop - -#if defined CONFIG_ETRAXFS -#include "../mach-fs/dram_init.S" -#elif defined CONFIG_CRIS_MACH_ARTPEC3 -#include "../mach-a3/dram_init.S" -#else -#error Only ETRAXFS and ARTPEC-3 supported! -#endif - - -_dram_initialized: - ;; Copy the text and data section to DRAM. This depends on that the - ;; variables used below are correctly set up by the linker script. - ;; The calculated value stored in R4 is used below. - ;; Leave the cramfs file system (piggybacked after the kernel) in flash. - moveq 0, $r0 ; Source. - move.d text_start, $r1 ; Destination. - move.d __vmlinux_end, $r2 - move.d $r2, $r4 - sub.d $r1, $r4 -1: move.w [$r0+], $r3 - move.w $r3, [$r1+] - cmp.d $r2, $r1 - blo 1b - nop - - ;; Check for cramfs. - moveq 0, $r0 - move.d romfs_length, $r1 - move.d $r0, [$r1] - move.d [$r4], $r0 ; cramfs_super.magic - cmp.d CRAMFS_MAGIC, $r0 - bne 1f - nop - - ;; Set length and start of cramfs, set romfs_in_flash flag - addoq +4, $r4, $acr - move.d [$acr], $r0 - move.d romfs_length, $r1 - move.d $r0, [$r1] - add.d 0xf0000000, $r4 ; Add cached flash start in virtual memory. - move.d romfs_start, $r1 - move.d $r4, [$r1] -1: moveq 1, $r0 - move.d romfs_in_flash, $r1 - move.d $r0, [$r1] - - jump _start_it ; Jump to cached code. - nop - -_inram: - ;; Check if booting from NAND flash; if so, set appropriate flags - ;; and move on. - cmp.d NAND_BOOT_MAGIC, $r12 - bne move_cramfs ; not nand, jump - moveq 1, $r0 - move.d nand_boot, $r1 ; tell axisflashmap we're booting from NAND - move.d $r0, [$r1] - moveq 0, $r0 ; tell axisflashmap romfs is not in - move.d romfs_in_flash, $r1 ; (directly accessed) flash - move.d $r0, [$r1] - jump _start_it ; continue with boot - nop - -move_cramfs: - ;; kernel is in DRAM. - ;; Must figure out if there is a piggybacked rootfs image or not. - ;; Set romfs_length to 0 => no rootfs image available by default. - moveq 0, $r0 - move.d romfs_length, $r1 - move.d $r0, [$r1] - - ;; The kernel could have been unpacked to DRAM by the loader, but - ;; the cramfs image could still be in the flash immediately - ;; following the compressed kernel image. The loader passes the address - ;; of the byte succeeding the last compressed byte in the flash in - ;; register R9 when starting the kernel. - cmp.d 0x0ffffff8, $r9 - bhs _no_romfs_in_flash ; R9 points outside the flash area. - nop - ;; cramfs rootfs might to be in flash. Check for it. - move.d [$r9], $r0 ; cramfs_super.magic - cmp.d CRAMFS_MAGIC, $r0 - bne _no_romfs_in_flash - nop - - ;; found cramfs in flash. set address and size, and romfs_in_flash flag. - addoq +4, $r9, $acr - move.d [$acr], $r0 - move.d romfs_length, $r1 - move.d $r0, [$r1] - add.d 0xf0000000, $r9 ; Add cached flash start in virtual memory. - move.d romfs_start, $r1 - move.d $r9, [$r1] - moveq 1, $r0 - move.d romfs_in_flash, $r1 - move.d $r0, [$r1] - - jump _start_it ; Jump to cached code. - nop - -_no_romfs_in_flash: - ;; No romfs in flash, so look for cramfs, or jffs2 with jhead, - ;; after kernel in RAM, as is the case with network->RAM boot. - ;; For cramfs, partition starts with magic and length. - ;; For jffs2, a jhead is prepended which contains with magic and length. - ;; The jhead is not part of the jffs2 partition however. - move.d __bss_start, $r0 - move.d [$r0], $r1 - cmp.d CRAMFS_MAGIC, $r1 ; cramfs magic? - beq 2f ; yes, jump - nop - cmp.d JHEAD_MAGIC, $r1 ; jffs2 (jhead) magic? - bne 4f ; no, skip copy - nop - addq 4, $r0 ; location of jffs2 size - move.d [$r0+], $r2 ; fetch jffs2 size -> r2 - ; r0 now points to start of jffs2 - ba 3f - nop -2: - addoq +4, $r0, $acr ; location of cramfs size - move.d [$acr], $r2 ; fetch cramfs size -> r2 - ; r0 still points to start of cramfs -3: - ;; Now, move the root fs to after kernel's BSS - - move.d _end, $r1 ; start of cramfs -> r1 - move.d romfs_start, $r3 - move.d $r1, [$r3] ; store at romfs_start (for axisflashmap) - move.d romfs_length, $r3 - move.d $r2, [$r3] ; store size at romfs_length - - add.d $r2, $r0 ; copy from end and downwards - add.d $r2, $r1 - - lsrq 1, $r2 ; Size is in bytes, we copy words. - addq 1, $r2 -1: - move.w [$r0], $r3 - move.w $r3, [$r1] - subq 2, $r0 - subq 2, $r1 - subq 1, $r2 - bne 1b - nop - -4: - ;; BSS move done. - ;; Clear romfs_in_flash flag, as we now know romfs is in DRAM - ;; Also clear nand_boot flag; if we got here, we know we've not - ;; booted from NAND flash. - moveq 0, $r0 - move.d romfs_in_flash, $r1 - move.d $r0, [$r1] - moveq 0, $r0 - move.d nand_boot, $r1 - move.d $r0, [$r1] - - jump _start_it ; Jump to cached code. - nop - -_start_it: - - ;; Check if kernel command line is supplied - cmp.d COMMAND_LINE_MAGIC, $r10 - bne no_command_line - nop - - move.d 256, $r13 - move.d cris_command_line, $r10 - or.d 0x80000000, $r11 ; Make it virtual -1: - move.b [$r11+], $r1 - move.b $r1, [$r10+] - subq 1, $r13 - bne 1b - nop - -no_command_line: - - ;; The kernel stack contains a task structure for each task. This - ;; the initial kernel stack is in the same page as the init_task, - ;; but starts at the top of the page, i.e. + 8192 bytes. - move.d init_thread_union + 8192, $sp - move.d ebp_start, $r0 ; Defined in linker-script. - move $r0, $ebp - move.d etrax_irv, $r1 ; Set the exception base register and pointer. - move.d $r0, [$r1] - - ;; Clear the BSS region from _bss_start to _end. - move.d __bss_start, $r0 - move.d _end, $r1 -1: clear.d [$r0+] - cmp.d $r1, $r0 - blo 1b - nop - - ; Initialize registers to increase determinism - move.d __bss_start, $r0 - movem [$r0], $r13 - -#ifdef CONFIG_ETRAX_L2CACHE - jsr l2cache_init - nop -#endif - - jump start_kernel ; Jump to start_kernel() in init/main.c. - nop - - .data -etrax_irv: - .dword 0 - -; Variables for communication with the Axis flash map driver (axisflashmap), -; and for setting up memory in arch/cris/kernel/setup.c . - -; romfs_start is set to the start of the root file system, if it exists -; in directly accessible memory (i.e. NOR Flash when booting from Flash, -; or RAM when booting directly from a network-downloaded RAM image) -romfs_start: - .dword 0 - -; romfs_length is set to the size of the root file system image, if it exists -; in directly accessible memory (see romfs_start). Otherwise it is set to 0. -romfs_length: - .dword 0 - -; romfs_in_flash is set to 1 if the root file system resides in directly -; accessible flash memory (i.e. NOR flash). It is set to 0 for RAM boot -; or NAND flash boot. -romfs_in_flash: - .dword 0 - -; nand_boot is set to 1 when the kernel has been booted from NAND flash -nand_boot: - .dword 0 - -swapper_pg_dir = 0xc0002000 - - .section ".init.data", "aw" - -#if defined CONFIG_ETRAXFS -#include "../mach-fs/hw_settings.S" -#elif defined CONFIG_CRIS_MACH_ARTPEC3 -#include "../mach-a3/hw_settings.S" -#else -#error Only ETRAXFS and ARTPEC-3 supported! -#endif |