diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mcp750/start')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mcp750/start/Makefile.in | 65 | ||||
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mcp750/start/start.S | 149 |
2 files changed, 214 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/mcp750/start/Makefile.in b/c/src/lib/libbsp/powerpc/mcp750/start/Makefile.in new file mode 100644 index 0000000000..eef37a650e --- /dev/null +++ b/c/src/lib/libbsp/powerpc/mcp750/start/Makefile.in @@ -0,0 +1,65 @@ +# +# $Id$ +# + +@SET_MAKE@ +srcdir = @srcdir@ +top_srcdir = @top_srcdir@ +top_builddir = ../../../../../../.. +subdir = c/src/lib/libbsp/powerpc/mcp750/start + +INSTALL = @INSTALL@ + +RTEMS_ROOT = $(top_srcdir)/@RTEMS_TOPdir@ +PROJECT_ROOT = @PROJECT_ROOT@ + +VPATH = @srcdir@ + +PGM=${ARCH}/start.o + +# C source names, if any, go here -- minus the .c +C_PIECES= +C_FILES=$(C_PIECES:%=%.c) +C_O_FILES=$(C_PIECES:%=${ARCH}/%.o) + +H_FILES= + +# Assembly source names, if any, go here -- minus the .S +S_PIECES=start +S_FILES=$(S_PIECES:%=%.S) +S_O_FILES=$(S_FILES:%.S=${ARCH}/%.o) + +SRCS=$(C_FILES) $(CC_FILES) $(H_FILES) $(S_FILES) +OBJS=$(C_O_FILES) $(CC_O_FILES) $(S_O_FILES) + +include $(RTEMS_ROOT)/make/custom/${RTEMS_BSP}.cfg +include $(RTEMS_ROOT)/make/leaf.cfg + +# +# (OPTIONAL) Add local stuff here using += +# + +DEFINES += +CPPFLAGS += +CFLAGS += + +LD_PATHS += +LD_LIBS += +LDFLAGS += + +# +# Add your list of files to delete here. The config files +# already know how to delete some stuff, so you may want +# to just run 'make clean' first to see what gets missed. +# 'make clobber' already includes 'make clean' +# + +CLEAN_ADDITIONS += +CLOBBER_ADDITIONS += + +all: ${ARCH} $(SRCS) $(OBJS) $(PGM) + $(INSTALL_VARIANT) -m 555 ${PGM} ${PROJECT_RELEASE}/lib + +Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status + cd $(top_builddir) \ + && CONFIG_FILES=$(subdir)/$@ CONFIG_HEADERS= $(SHELL) ./config.status diff --git a/c/src/lib/libbsp/powerpc/mcp750/start/start.S b/c/src/lib/libbsp/powerpc/mcp750/start/start.S new file mode 100644 index 0000000000..6751f59a0d --- /dev/null +++ b/c/src/lib/libbsp/powerpc/mcp750/start/start.S @@ -0,0 +1,149 @@ +/* + * arch/ppc/kernel/head.S + * + * $Id$ + * + * PowerPC version + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP + * Adapted for Power Macintosh by Paul Mackerras. + * Low-level exception handlers and MMU support + * rewritten by Paul Mackerras. + * Copyright (C) 1996 Paul Mackerras. + * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net). + * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). + * + * This file contains the low-level support and setup for the + * PowerPC platform, including trap and interrupt dispatch. + * Also included here is low-level thread/task switch support. + * + * This program 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. + * + */ + +#include <libcpu/cpu.h> +#include <libcpu/io.h> +#include <rtems/score/targopts.h> +#include "asm.h" + +#define SYNC \ + sync; \ + isync + +#define KERNELBASE 0x0 + +#define MONITOR_ENTER \ + mfmsr r10 ; \ + ori r10,r10,MSR_IP ; \ + mtmsr r10 ; \ + li r10,0x63 ; \ + sc + + .text + .globl __rtems_entry_point + .type __rtems_entry_point,@function +__rtems_entry_point: +#ifdef DEBUG_EARLY_START + MONITOR_ENTER +#endif + +/* + * PREP + * This is jumped to on prep systems right after the kernel is relocated + * to its proper place in memory by the boot loader. The expected layout + * of the regs is: + * r3: ptr to residual data + * r4: initrd_start or if no initrd then 0 + * r5: initrd_end - unused if r4 is 0 + * r6: Start of command line string + * r7: End of command line string + * + */ + + mr r31,r3 /* save parameters */ + mr r30,r4 + mr r29,r5 + mr r28,r6 + mr r27,r7 +/* + * Use the first pair of BAT registers to map the 1st 64MB + * of RAM to KERNELBASE. + */ + lis r11,KERNELBASE@h + ori r11,r11,0x7fe /* set up BAT registers for 604 */ + li r8,2 /* R/W access */ + mtspr DBAT0L,r8 /* N.B. 6xx (not 601) have valid */ + mtspr DBAT0U,r11 /* bit in upper BAT register */ + mtspr IBAT0L,r8 + mtspr IBAT0U,r11 + isync + +/* + * we now have the 1st 64M of ram mapped with the bats. + */ + +enter_C_code: + bl MMUon + /* + * stack = &__rtems_end + 4096 + */ + addis r9,r0, __rtems_end+4096@ha + addi r9,r9, __rtems_end+4096@l + mr r1, r9 + bl zero_bss + /* + * restore prep boot params + */ + mr r3,r31 + mr r4,r30 + mr r5,r29 + mr r6,r28 + mr r7,r27 + bl save_boot_params + bl boot_card + bl _return_to_ppcbug + + .globl MMUon + .type MMUon,@function +MMUon: + mfmsr r0 + ori r0,r0, MSR_IP | MSR_RI | MSR_IR | MSR_DR | MSR_EE | MSR_FE0 | MSR_FE1 + xori r0, r0, MSR_EE | MSR_IP | MSR_FP + mflr r11 + mtsrr0 r11 + mtsrr1 r0 + SYNC + rfi + + .globl MMUoff + .type MMUoff,@function +MMUoff: + mfmsr r0 + ori r0,r0,MSR_IR| MSR_DR | MSR_IP + mflr r11 + xori r0,r0,MSR_IR|MSR_DR + mtsrr0 r11 + mtsrr1 r0 + SYNC + rfi + + .globl _return_to_ppcbug + .type _return_to_ppcbug,@function + + +_return_to_ppcbug: + mflr r30 + bl MMUoff + MONITOR_ENTER + bl MMUon + mtctr r30 + bctr + + + + + |