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-rw-r--r--arch/cris/arch-v32/kernel/head.S439
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diff --git a/arch/cris/arch-v32/kernel/head.S b/arch/cris/arch-v32/kernel/head.S
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index 92f9fb1f6845..000000000000
--- a/arch/cris/arch-v32/kernel/head.S
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-/* 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
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