diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/head.S')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/head.S | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/head.S b/target/linux/ubicom32/files/arch/ubicom32/kernel/head.S deleted file mode 100644 index 0c60504af5..0000000000 --- a/target/linux/ubicom32/files/arch/ubicom32/kernel/head.S +++ /dev/null @@ -1,273 +0,0 @@ -/* - * arch/ubicom32/kernel/head.S - * <TODO: Replace with short file description> - * - * (C) Copyright 2009, Ubicom, Inc. - * - * This file is part of the Ubicom32 Linux Kernel Port. - * - * The Ubicom32 Linux Kernel Port is free software: you can redistribute - * it and/or modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, either version 2 of the - * License, or (at your option) any later version. - * - * The Ubicom32 Linux Kernel Port is distributed in the hope that it - * will be useful, but WITHOUT ANY WARRANTY; without even the implied - * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See - * the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with the Ubicom32 Linux Kernel Port. If not, - * see <http://www.gnu.org/licenses/>. - * - * Ubicom32 implementation derived from (with many thanks): - * arch/m68knommu - * arch/blackfin - * arch/parisc - */ -#include <linux/sys.h> -#include <linux/linkage.h> -#include <asm/asm-offsets.h> -#include <asm/page_offset.h> -#define __ASM__ -#include <asm/ip5000.h> - - -#define SRC_AN A3 -#define DST_AN A4 - -#define PARAM_DN D0 -#define TMP_DN D15 -#define TMP2_DN D14 - -/* - * The following code is placed at the start of the Linux section of memory. - * This is the primary entry point for Linux. - * - * However, we also want the syscall entry/exit code to be at a fixed address. - * So we take the primary entry point and reserve 16 bytes. That address is - * where the system_call entry point exists. This 16 bytes basically allows - * us to jump around the system_call entry point code to the actual startup - * code. - * - * Linux Memory Map (see vlinux.lds.S): - * 0x40400000 - Primary Entry Point for Linux (jump around code below). - * 0x40400010 - Old syscall Entry Point. - */ - - .sect .skip_syscall, "ax", @progbits - .global __skip_syscall_section -__skip_syscall_section: - moveai A3, #%hi(_start) - lea.1 A3, %lo(_start)(A3) - ret A3 -/* - * __os_node_offset contains the offset from KERNELBASE to the os_node, it is - * not intended to be used by anything except the boot code. - */ -__os_node_offset: -.long (_os_node - KERNELSTART) - -.text -.global _start - -/* - * start() - * This is the start of the Linux kernel. - */ -_start: - move.4 SCRATCHPAD1, #0 - - -/* - * Setup the range registers... the loader has setup a few, but we will go ahead - * and correct them for our own limits. Note that once set these are never - * changed again. The ranges are as follows - * - * D_RANGE0 - io block (set up by loaded) - * - * I_RANGE0 and D_RANGE1 - kernel/ultra loader address space bottom of ocm-> top - * of ram typically 0x3ffc0000 - 0x440000000 - * I_RANGE1 - kernel / userspace transition area (aka syscalls, context switches) - * typically 0x3FFC0030 - ~0x3FFC0200 - * I_RANGE2 / D_RANGE2 - slab area - * typically 0x40A00000 - ~0x44000000 - * I_RANGE3 - * old system call interface if enabled. - * - * D_RANGE3, D_RANGE4 - unused. - */ - moveai SRC_AN, #%hi(PAGE_OFFSET_RAW) - lea.4 SRC_AN, %lo(PAGE_OFFSET_RAW)(SRC_AN) - move.4 D_RANGE1_LO, SRC_AN - move.4 I_RANGE0_LO, SRC_AN - -; don't try to calculate I_RANGE_HI, see below -; moveai SRC_AN, #%hi(___init_end-4) -; lea.4 SRC_AN, %lo(___init_end-4)(SRC_AN) -; move.4 I_RANGE0_HI, SRC_AN - - moveai SRC_AN, #%hi(SDRAMSTART + CONFIG_MIN_RAMSIZE-4) - lea.4 SRC_AN, %lo(SDRAMSTART + CONFIG_MIN_RAMSIZE-4)(SRC_AN) - move.4 D_RANGE1_HI, SRC_AN - -; for now allow the whole ram to be executable as well so we don't run into problems -; once we load user more code. - move.4 I_RANGE0_HI, SRC_AN - -#ifdef CONFIG_PROTECT_KERNEL -; when kernel protection is enabled, we only open up syscall and non kernel text -; for userspace apps, for now only irange registers registers 1 and 2 are used for userspace. - - ;; syscall range - moveai SRC_AN, #%hi(__syscall_text_run_begin) - lea.4 SRC_AN, %lo(__syscall_text_run_begin)(SRC_AN) - move.4 I_RANGE1_LO, SRC_AN - moveai SRC_AN, #%hi(__syscall_text_run_end) - lea.4 SRC_AN, %lo(__syscall_text_run_end)(SRC_AN) - move.4 I_RANGE1_HI, SRC_AN - - ;; slab instructions - moveai SRC_AN, #%hi(_edata) - lea.4 SRC_AN, %lo(_edata)(SRC_AN) - move.4 I_RANGE2_LO, SRC_AN - ;; End of DDR is already in range0 hi so just copy it. - move.4 I_RANGE2_HI, I_RANGE0_HI - -#ifdef CONFIG_OLD_40400010_SYSTEM_CALL - ;; create a small hole for old syscall location - moveai SRC_AN, #%hi(0x40400000) - lea.4 I_RANGE3_LO, 0x10(SRC_AN) - lea.4 I_RANGE3_HI, 0x14(SRC_AN) -#endif - ;; slab data (same as slab instructions but starting a little earlier). - moveai SRC_AN, #%hi(_data_protection_end) - lea.4 SRC_AN, %lo(_data_protection_end)(SRC_AN) - move.4 D_RANGE2_LO, SRC_AN - move.4 D_RANGE2_HI, I_RANGE0_HI - -;; enable ranges - ;; skip I_RANGE0_EN - move.4 I_RANGE1_EN, #-1 - move.4 I_RANGE2_EN, #-1 -#ifdef CONFIG_OLD_40400010_SYSTEM_CALL - move.4 I_RANGE3_EN, #-1 -#else - move.4 I_RANGE3_EN, #0 -#endif - ;; skip D_RANGE0_EN or D_RANGE1_EN - move.4 D_RANGE2_EN, #-1 - move.4 D_RANGE3_EN, #0 - move.4 D_RANGE4_EN, #0 -#endif - -; -; If __ocm_free_begin is smaller than __ocm_free_end the -; setup OCM text and data ram banks properly -; - moveai DST_AN, #%hi(__ocm_free_begin) - lea.4 TMP_DN, %lo(__ocm_free_begin)(DST_AN) - moveai DST_AN, #%hi(__ocm_free_end) - lea.4 TMP2_DN, %lo(__ocm_free_end)(DST_AN) - sub.4 #0, TMP2_DN, TMP_DN - jmple.f 2f - moveai DST_AN, #%hi(__data_begin) - lea.4 TMP_DN, %lo(__data_begin)(DST_AN) - moveai DST_AN, #%hi(OCMSTART) - lea.4 TMP2_DN, %lo(OCMSTART)(DST_AN) - sub.4 TMP_DN, TMP_DN, TMP2_DN - lsr.4 TMP_DN, TMP_DN, #15 - lsl.4 TMP_DN, #1, TMP_DN - moveai DST_AN, #%hi(OCMC_BASE) - add.4 OCMC_BANK_MASK(DST_AN), #-1, TMP_DN - pipe_flush 0 -2: -; -; Load .ocm_text -; - moveai DST_AN, #%hi(__ocm_text_run_end) - lea.4 TMP_DN, %lo(__ocm_text_run_end)(DST_AN) - moveai DST_AN, #%hi(__ocm_text_run_begin) - lea.4 DST_AN, %lo(__ocm_text_run_begin)(DST_AN) - moveai SRC_AN, #%hi(__ocm_text_load_begin) - lea.4 SRC_AN, %lo(__ocm_text_load_begin)(SRC_AN) - jmpt.t 2f - -1: move.4 (DST_AN)4++, (SRC_AN)4++ - -2: sub.4 #0, DST_AN, TMP_DN - jmpne.t 1b -; -; Load .syscall_text -; - moveai DST_AN, #%hi(__syscall_text_run_end) - lea.4 TMP_DN, %lo(__syscall_text_run_end)(DST_AN) - moveai DST_AN, #%hi(__syscall_text_run_begin) - lea.4 DST_AN, %lo(__syscall_text_run_begin)(DST_AN) - moveai SRC_AN, #%hi(__syscall_text_load_begin) - lea.4 SRC_AN, %lo(__syscall_text_load_begin)(SRC_AN) - jmpt.t 2f - -1: move.4 (DST_AN)4++, (SRC_AN)4++ - -2: sub.4 #0, DST_AN, TMP_DN - jmpne.t 1b - -; -; Load .ocm_data -; - moveai DST_AN, #%hi(__ocm_data_run_end) - lea.4 TMP_DN, %lo(__ocm_data_run_end)(DST_AN) - moveai DST_AN, #%hi(__ocm_data_run_begin) - lea.4 DST_AN, %lo(__ocm_data_run_begin)(DST_AN) - moveai SRC_AN, #%hi(__ocm_data_load_begin) - lea.4 SRC_AN, %lo(__ocm_data_load_begin)(SRC_AN) - jmpt.t 2f - -1: move.4 (DST_AN)4++, (SRC_AN)4++ - -2: sub.4 #0, DST_AN, TMP_DN - jmpne.t 1b - -; Clear .bss -; - moveai SRC_AN, #%hi(_ebss) - lea.4 TMP_DN, %lo(_ebss)(SRC_AN) - moveai DST_AN, #%hi(_sbss) - lea.4 DST_AN, %lo(_sbss)(DST_AN) - jmpt.t 2f - -1: move.4 (DST_AN)4++, #0 - -2: sub.4 #0, DST_AN, TMP_DN - jmpne.t 1b - -; save our parameter to devtree (after clearing .bss) - moveai DST_AN, #%hi(devtree) - lea.4 DST_AN, %lo(devtree)(DST_AN) - move.4 (DST_AN), PARAM_DN - - moveai sp, #%hi(init_thread_union) - lea.4 sp, %lo(init_thread_union)(sp) - movei TMP_DN, #ASM_THREAD_SIZE - add.4 sp, sp, TMP_DN - move.4 -4(sp)++, #0 ; nesting level = 0 - move.4 -4(sp)++, #1 ; KERNEL_THREAD - -;; ip3k-elf-gdb backend now sets scratchpad3 to 1 when either continue -;; or single step commands are issued. scratchpad3 is set to 0 when the -;; debugger detaches from the board. - move.4 TMP_DN, scratchpad3 - lsl.4 TMP_DN, TMP_DN, #0x0 - jmpeq.f _jump_to_start_kernel -_ok_to_set_break_points_in_linux: -;; THREAD_STALL - move.4 mt_dbg_active_clr,#-1 -;; stalling the threads isn't instantaneous.. need to flush the pipe. - pipe_flush 0 - pipe_flush 0 - -_jump_to_start_kernel: - moveai SRC_AN, #%hi(start_kernel) - lea.4 SRC_AN, %lo(start_kernel)(SRC_AN) - ret SRC_AN |