[U-Boot] [PATCH v2 3/9] openrisc: Add cpu files
Stefan Kristiansson
stefan.kristiansson at saunalahti.fi
Sun Nov 27 06:04:51 CET 2011
Signed-off-by: Stefan Kristiansson <stefan.kristiansson at saunalahti.fi>
---
Changes in v2:
- Fix missing newline
- Bugfix for cache line size reading
- Make l.nop asm statements volatile
- Fix include order (asm after non-asm)
- Add static to functions only called locally
- Make unhandled exception printout into a look-up table
arch/openrisc/config.mk | 27 ++++
arch/openrisc/cpu/Makefile | 47 ++++++
arch/openrisc/cpu/cache.c | 151 ++++++++++++++++++
arch/openrisc/cpu/cpu.c | 157 +++++++++++++++++++
arch/openrisc/cpu/exceptions.c | 85 ++++++++++
arch/openrisc/cpu/interrupts.c | 121 +++++++++++++++
arch/openrisc/cpu/start.S | 335 ++++++++++++++++++++++++++++++++++++++++
7 files changed, 923 insertions(+), 0 deletions(-)
create mode 100644 arch/openrisc/config.mk
create mode 100644 arch/openrisc/cpu/Makefile
create mode 100644 arch/openrisc/cpu/cache.c
create mode 100644 arch/openrisc/cpu/cpu.c
create mode 100644 arch/openrisc/cpu/exceptions.c
create mode 100644 arch/openrisc/cpu/interrupts.c
create mode 100644 arch/openrisc/cpu/start.S
diff --git a/arch/openrisc/config.mk b/arch/openrisc/config.mk
new file mode 100644
index 0000000..521e73a
--- /dev/null
+++ b/arch/openrisc/config.mk
@@ -0,0 +1,27 @@
+#
+# (C) Copyright 2011
+# Julius Baxter <julius at opencores.org>
+#
+# 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.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+CROSS_COMPILE ?= or32-elf-
+
+# r10 used for global object pointer, already set in OR32 GCC but just to be
+# clear
+PLATFORM_CPPFLAGS += -DCONFIG_OPENRISC -D__OR1K__ -ffixed-r10
+
+CONFIG_STANDALONE_LOAD_ADDR ?= 0x40000
diff --git a/arch/openrisc/cpu/Makefile b/arch/openrisc/cpu/Makefile
new file mode 100644
index 0000000..b3b1a24
--- /dev/null
+++ b/arch/openrisc/cpu/Makefile
@@ -0,0 +1,47 @@
+#
+# (C) Copyright 2011
+# Julius Baxter <julius at opencores.org>
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB = $(obj)lib$(CPU).o
+
+START = start.o
+COBJS-y = cache.o cpu.o exceptions.o interrupts.o
+
+SRCS := $(START:.o=.S) $(COBJS-y:.o=.c)
+OBJS := $(addprefix $(obj),$(COBJS-y))
+START := $(addprefix $(obj),$(START))
+
+all: $(obj).depend $(START) $(LIB)
+
+$(LIB): $(OBJS)
+ $(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/arch/openrisc/cpu/cache.c b/arch/openrisc/cpu/cache.c
new file mode 100644
index 0000000..2a73a4f
--- /dev/null
+++ b/arch/openrisc/cpu/cache.c
@@ -0,0 +1,151 @@
+/*
+ * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson at saunalahti.fi>
+ * (C) Copyright 2011, Julius Baxter <julius at opencores.org>
+ *
+ * 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/system.h>
+
+void flush_dcache_range(unsigned long addr, unsigned long stop)
+{
+ ulong block_size = (mfspr(SPR_DCCFGR) & SPR_DCCFGR_CBS) ? 32 : 16;
+
+ while (addr < stop) {
+ mtspr(SPR_DCBFR, addr);
+ addr += block_size;
+ }
+}
+
+void invalidate_dcache_range(unsigned long addr, unsigned long stop)
+{
+ ulong block_size = (mfspr(SPR_DCCFGR) & SPR_DCCFGR_CBS) ? 32 : 16;
+
+ while (addr < stop) {
+ mtspr(SPR_DCBIR, addr);
+ addr += block_size;
+ }
+}
+
+static void invalidate_icache_range(unsigned long addr, unsigned long stop)
+{
+ ulong block_size = (mfspr(SPR_ICCFGR) & SPR_ICCFGR_CBS) ? 32 : 16;
+
+ while (addr < stop) {
+ mtspr(SPR_ICBIR, addr);
+ addr += block_size;
+ }
+}
+
+void flush_cache(unsigned long addr, unsigned long size)
+{
+ flush_dcache_range(addr, addr + size);
+ invalidate_icache_range(addr, addr + size);
+}
+
+int icache_status(void)
+{
+ return mfspr(SPR_SR) & SPR_SR_ICE;
+}
+
+int checkicache(void)
+{
+ unsigned long iccfgr;
+ unsigned long cache_set_size;
+ unsigned long cache_ways;
+ unsigned long cache_block_size;
+
+ iccfgr = mfspr(SPR_ICCFGR);
+ cache_ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
+ cache_set_size = 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3);
+ cache_block_size = (iccfgr & SPR_ICCFGR_CBS) ? 32 : 16;
+
+ return cache_set_size * cache_ways * cache_block_size;
+}
+
+int dcache_status(void)
+{
+ return mfspr(SPR_SR) & SPR_SR_DCE;
+}
+
+int checkdcache(void)
+{
+ unsigned long dccfgr;
+ unsigned long cache_set_size;
+ unsigned long cache_ways;
+ unsigned long cache_block_size;
+
+ dccfgr = mfspr(SPR_DCCFGR);
+ cache_ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
+ cache_set_size = 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3);
+ cache_block_size = (dccfgr & SPR_DCCFGR_CBS) ? 32 : 16;
+
+ return cache_set_size * cache_ways * cache_block_size;
+}
+
+void dcache_enable(void)
+{
+ mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_DCE);
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+}
+
+void dcache_disable(void)
+{
+ mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_DCE);
+}
+
+void icache_enable(void)
+{
+ mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_ICE);
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+ asm volatile("l.nop");
+}
+
+void icache_disable(void)
+{
+ mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_ICE);
+}
+
+int cache_init(void)
+{
+ if (mfspr(SPR_UPR) & SPR_UPR_ICP) {
+ icache_disable();
+ invalidate_icache_range(0, checkicache());
+ icache_enable();
+ }
+
+ if (mfspr(SPR_UPR) & SPR_UPR_DCP) {
+ dcache_disable();
+ invalidate_dcache_range(0, checkdcache());
+ dcache_enable();
+ }
+
+ return 0;
+}
diff --git a/arch/openrisc/cpu/cpu.c b/arch/openrisc/cpu/cpu.c
new file mode 100644
index 0000000..25cd624
--- /dev/null
+++ b/arch/openrisc/cpu/cpu.c
@@ -0,0 +1,157 @@
+/*
+ * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson at saunalahti.fi>
+ * (C) Copyright 2011, Julius Baxter <julius at opencores.org>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/system.h>
+#include <asm/openrisc_exc.h>
+
+static volatile int illegal_instruction;
+
+static void illegal_instruction_handler(void)
+{
+ ulong *epcr = (ulong *)mfspr(SPR_EPCR_BASE);
+
+ /* skip over the illegal instruction */
+ mtspr(SPR_EPCR_BASE, (ulong)(++epcr));
+ illegal_instruction = 1;
+}
+
+static void checkinstructions(void)
+{
+ ulong ra = 1, rb = 1, rc;
+
+ exception_install_handler(EXC_ILLEGAL_INSTR,
+ illegal_instruction_handler);
+
+ illegal_instruction = 0;
+ asm volatile("l.mul %0,%1,%2" : "=r" (rc) : "r" (ra), "r" (rb));
+ printf(" Hardware multiplier: %s\n",
+ illegal_instruction ? "no" : "yes");
+
+ illegal_instruction = 0;
+ asm volatile("l.div %0,%1,%2" : "=r" (rc) : "r" (ra), "r" (rb));
+ printf(" Hardware divider: %s\n",
+ illegal_instruction ? "no" : "yes");
+
+ exception_free_handler(EXC_ILLEGAL_INSTR);
+}
+
+int checkcpu(void)
+{
+ ulong upr = mfspr(SPR_UPR);
+ ulong vr = mfspr(SPR_VR);
+ ulong iccfgr = mfspr(SPR_ICCFGR);
+ ulong dccfgr = mfspr(SPR_DCCFGR);
+ ulong immucfgr = mfspr(SPR_IMMUCFGR);
+ ulong dmmucfgr = mfspr(SPR_DMMUCFGR);
+ ulong cpucfgr = mfspr(SPR_CPUCFGR);
+ uint ver = (vr & SPR_VR_VER) >> 24;
+ uint rev = vr & SPR_VR_REV;
+ uint block_size;
+ uint ways;
+ uint sets;
+
+ printf("CPU: OpenRISC-%x00 (rev %d) @ %d MHz\n",
+ ver, rev, (CONFIG_SYS_CLK_FREQ / 1000000));
+
+ if (upr & SPR_UPR_DCP) {
+ block_size = (dccfgr & SPR_DCCFGR_CBS) ? 32 : 16;
+ ways = 1 << (dccfgr & SPR_DCCFGR_NCW);
+ printf(" D-Cache: %d bytes, %d bytes/line, %d way(s)\n",
+ checkdcache(), block_size, ways);
+ } else {
+ printf(" D-Cache: no\n");
+ }
+
+ if (upr & SPR_UPR_ICP) {
+ block_size = (iccfgr & SPR_ICCFGR_CBS) ? 32 : 16;
+ ways = 1 << (iccfgr & SPR_ICCFGR_NCW);
+ printf(" I-Cache: %d bytes, %d bytes/line, %d way(s)\n",
+ checkicache(), block_size, ways);
+ } else {
+ printf(" I-Cache: no\n");
+ }
+
+ if (upr & SPR_UPR_DMP) {
+ sets = 1 << ((dmmucfgr & SPR_DMMUCFGR_NTS) >> 2);
+ ways = (dmmucfgr & SPR_DMMUCFGR_NTW) + 1;
+ printf(" DMMU: %d sets, %d way(s)\n",
+ sets, ways);
+ } else {
+ printf(" DMMU: no\n");
+ }
+
+ if (upr & SPR_UPR_IMP) {
+ sets = 1 << ((immucfgr & SPR_IMMUCFGR_NTS) >> 2);
+ ways = (immucfgr & SPR_IMMUCFGR_NTW) + 1;
+ printf(" IMMU: %d sets, %d way(s)\n",
+ sets, ways);
+ } else {
+ printf(" IMMU: no\n");
+ }
+
+ printf(" MAC unit: %s\n",
+ (upr & SPR_UPR_MP) ? "yes" : "no");
+ printf(" Debug unit: %s\n",
+ (upr & SPR_UPR_DUP) ? "yes" : "no");
+ printf(" Performance counters: %s\n",
+ (upr & SPR_UPR_PCUP) ? "yes" : "no");
+ printf(" Power management: %s\n",
+ (upr & SPR_UPR_PMP) ? "yes" : "no");
+ printf(" Interrupt controller: %s\n",
+ (upr & SPR_UPR_PICP) ? "yes" : "no");
+ printf(" Timer: %s\n",
+ (upr & SPR_UPR_TTP) ? "yes" : "no");
+ printf(" Custom unit(s): %s\n",
+ (upr & SPR_UPR_CUP) ? "yes" : "no");
+
+ printf(" Supported instructions:\n");
+ printf(" ORBIS32: %s\n",
+ (cpucfgr & SPR_CPUCFGR_OB32S) ? "yes" : "no");
+ printf(" ORBIS64: %s\n",
+ (cpucfgr & SPR_CPUCFGR_OB64S) ? "yes" : "no");
+ printf(" ORFPX32: %s\n",
+ (cpucfgr & SPR_CPUCFGR_OF32S) ? "yes" : "no");
+ printf(" ORFPX64: %s\n",
+ (cpucfgr & SPR_CPUCFGR_OF64S) ? "yes" : "no");
+
+ checkinstructions();
+
+ return 0;
+}
+
+int cleanup_before_linux(void)
+{
+ disable_interrupts();
+ return 0;
+}
+
+extern void __reset(void);
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ disable_interrupts();
+ __reset();
+ /* not reached, __reset does not return */
+ return 0;
+}
diff --git a/arch/openrisc/cpu/exceptions.c b/arch/openrisc/cpu/exceptions.c
new file mode 100644
index 0000000..5d9f117
--- /dev/null
+++ b/arch/openrisc/cpu/exceptions.c
@@ -0,0 +1,85 @@
+/*
+ * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson at saunalahti.fi>
+ * (C) Copyright 2011, Julius Baxter <julius at opencores.org>
+ *
+ * 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <stdio_dev.h>
+#include <asm/system.h>
+
+static const char * const excp_table[] = {
+ "Unknown exception",
+ "Reset",
+ "Bus Error",
+ "Data Page Fault",
+ "Instruction Page Fault",
+ "Tick Timer",
+ "Alignment",
+ "Illegal Instruction",
+ "External Interrupt",
+ "D-TLB Miss",
+ "I-TLB Miss",
+ "Range",
+ "System Call",
+ "Floating Point",
+ "Trap",
+};
+
+static void (*handlers[32])(void);
+
+void exception_install_handler(int exception, void (*handler)(void))
+{
+ if (exception < 0 || exception > 31)
+ return;
+
+ handlers[exception] = handler;
+}
+
+void exception_free_handler(int exception)
+{
+ if (exception < 0 || exception > 31)
+ return;
+
+ handlers[exception] = 0;
+}
+
+static void exception_hang(int vect)
+{
+ printf("Unhandled exception at 0x%x ", vect & 0xff00);
+
+ vect = ((vect >> 8) & 0xff);
+ if (vect < ARRAY_SIZE(excp_table))
+ printf("(%s)\n", excp_table[vect]);
+ else
+ printf("(%s)\n", excp_table[0]);
+
+ printf("EPCR: 0x%08lx\n", mfspr(SPR_EPCR_BASE));
+ printf("EEAR: 0x%08lx\n", mfspr(SPR_EEAR_BASE));
+ printf("ESR: 0x%08lx\n", mfspr(SPR_ESR_BASE));
+ hang();
+}
+
+void exception_handler(int vect)
+{
+ int exception = vect >> 8;
+
+ if (handlers[exception])
+ handlers[exception]();
+ else
+ exception_hang(vect);
+}
diff --git a/arch/openrisc/cpu/interrupts.c b/arch/openrisc/cpu/interrupts.c
new file mode 100644
index 0000000..8f06724
--- /dev/null
+++ b/arch/openrisc/cpu/interrupts.c
@@ -0,0 +1,121 @@
+/*
+ * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson at saunalahti.fi>
+ * (C) Copyright 2011, Julius Baxter <julius at opencores.org>
+ *
+ * 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/types.h>
+#include <asm/ptrace.h>
+#include <asm/system.h>
+#include <asm/openrisc_exc.h>
+
+struct irq_action {
+ interrupt_handler_t *handler;
+ void *arg;
+ int count;
+};
+
+static struct irq_action handlers[32];
+
+void interrupt_handler(void)
+{
+ int irq;
+
+ while ((irq = ffs(mfspr(SPR_PICSR)))) {
+ if (handlers[--irq].handler) {
+ handlers[irq].handler(handlers[irq].arg);
+ handlers[irq].count++;
+ } else {
+ /* disable the interrupt */
+ mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1 << irq));
+ printf("Unhandled interrupt: %d\n", irq);
+ }
+ /* clear the interrupt */
+ mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1 << irq));
+ }
+}
+
+int interrupt_init(void)
+{
+ /* install handler for external interrupt exception */
+ exception_install_handler(EXC_EXT_IRQ, interrupt_handler);
+ /* Enable interrupts in supervisor register */
+ mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
+
+ return 0;
+}
+
+void enable_interrupts(void)
+{
+ /* Set interrupt enable bit in supervisor register */
+ mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
+ /* Enable timer exception */
+ mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_TEE);
+}
+
+int disable_interrupts(void)
+{
+ /* Clear interrupt enable bit in supervisor register */
+ mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_IEE);
+ /* Disable timer exception */
+ mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_TEE);
+
+ return 0;
+}
+
+void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
+{
+ if (irq < 0 || irq > 31)
+ return;
+
+ handlers[irq].handler = handler;
+ handlers[irq].arg = arg;
+}
+
+void irq_free_handler(int irq)
+{
+ if (irq < 0 || irq > 31)
+ return;
+
+ handlers[irq].handler = 0;
+ handlers[irq].arg = 0;
+}
+
+#if defined(CONFIG_CMD_IRQ)
+int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ int i;
+
+ printf("\nInterrupt-Information:\n\n");
+ printf("Nr Routine Arg Count\n");
+ printf("-----------------------------\n");
+
+ for (i = 0; i < 32; i++) {
+ if (handlers[i].handler) {
+ printf("%02d %08lx %08lx %d\n",
+ i,
+ (ulong)handlers[i].handler,
+ (ulong)handlers[i].arg,
+ handlers[i].count);
+ }
+ }
+ printf("\n");
+
+ return 0;
+}
+#endif
diff --git a/arch/openrisc/cpu/start.S b/arch/openrisc/cpu/start.S
new file mode 100644
index 0000000..3a42717
--- /dev/null
+++ b/arch/openrisc/cpu/start.S
@@ -0,0 +1,335 @@
+/*
+ * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson at saunalahti.fi>
+ * (C) Copyright 2011, Julius Baxter <julius at opencores.org>
+ *
+ * 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+#include <asm-offsets.h>
+#include <asm/spr-defs.h>
+
+#define EXCEPTION_STACK_SIZE (128+128)
+
+#define HANDLE_EXCEPTION \
+ l.addi r1, r1, -EXCEPTION_STACK_SIZE ;\
+ l.sw 0x1c(r1), r9 ;\
+ l.jal _exception_handler ;\
+ l.nop ;\
+ l.lwz r9, 0x1c(r1) ;\
+ l.addi r1, r1, EXCEPTION_STACK_SIZE ;\
+ l.rfe ;\
+ l.nop
+
+ .section .vectors, "ax"
+ .global __reset
+
+ /* reset */
+ .org 0x100
+__reset:
+ /* there is no guarantee r0 is hardwired to zero, clear it here */
+ l.andi r0, r0, 0
+ /* reset stack and frame pointers */
+ l.andi r1, r0, 0
+ l.andi r2, r0, 0
+
+ /* set supervisor mode */
+ l.ori r3,r0,SPR_SR_SM
+ l.mtspr r0,r3,SPR_SR
+
+ /* Relocate u-boot */
+ l.movhi r3,hi(__start) /* source start address */
+ l.ori r3,r3,lo(__start)
+ l.movhi r4,hi(_stext) /* dest start address */
+ l.ori r4,r4,lo(_stext)
+ l.movhi r5,hi(__end) /* dest end address */
+ l.ori r5,r5,lo(__end)
+
+.L_reloc:
+ l.lwz r6,0(r3)
+ l.sw 0(r4),r6
+ l.addi r3,r3,4
+ l.sfltu r4,r5
+ l.bf .L_reloc
+ l.addi r4,r4,4 /* delay slot */
+
+#ifdef CONFIG_SYS_RELOCATE_VECTORS
+ /* Relocate vectors from 0xf0000000 to 0x00000000 */
+ l.movhi r4, 0xf000 /* source */
+ l.movhi r5, 0 /* destination */
+ l.addi r6, r5, CONFIG_SYS_VECTORS_LEN /* length */
+.L_relocvectors:
+ l.lwz r7, 0(r4)
+ l.sw 0(r5), r7
+ l.addi r5, r5, 4
+ l.sfeq r5,r6
+ l.bnf .L_relocvectors
+ l.addi r4,r4, 4
+#endif
+
+ l.j _start
+ l.nop
+
+ /* bus error */
+ .org 0x200
+ HANDLE_EXCEPTION
+
+ /* data page fault */
+ .org 0x300
+ HANDLE_EXCEPTION
+
+ /* instruction page fault */
+ .org 0x400
+ HANDLE_EXCEPTION
+
+ /* tick timer */
+ .org 0x500
+ HANDLE_EXCEPTION
+
+ /* alignment */
+ .org 0x600
+ HANDLE_EXCEPTION
+
+ /* illegal instruction */
+ .org 0x700
+ HANDLE_EXCEPTION
+
+ /* external interrupt */
+ .org 0x800
+ HANDLE_EXCEPTION
+
+ /* D-TLB miss */
+ .org 0x900
+ HANDLE_EXCEPTION
+
+ /* I-TLB miss */
+ .org 0xa00
+ HANDLE_EXCEPTION
+
+ /* range */
+ .org 0xb00
+ HANDLE_EXCEPTION
+
+ /* system call */
+ .org 0xc00
+ HANDLE_EXCEPTION
+
+ /* floating point */
+ .org 0xd00
+ HANDLE_EXCEPTION
+
+ /* trap */
+ .org 0xe00
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0xf00
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1100
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1200
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1300
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1400
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1500
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1600
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1700
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1800
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1900
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1a00
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1b00
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1c00
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1d00
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1e00
+ HANDLE_EXCEPTION
+
+ /* reserved */
+ .org 0x1f00
+ HANDLE_EXCEPTION
+
+ /* Startup routine */
+ .text
+ .global _start
+_start:
+ /* Init stack and frame pointers */
+ l.movhi r1, hi(CONFIG_SYS_INIT_SP_ADDR)
+ l.ori r1, r1, lo(CONFIG_SYS_INIT_SP_ADDR)
+ l.or r2, r0, r1
+
+ /* clear BSS segments */
+ l.movhi r4, hi(_bss_start)
+ l.ori r4, r4, lo(_bss_start)
+ l.movhi r5, hi(_bss_end)
+ l.ori r5, r5, lo(_bss_end)
+.L_clear_bss:
+ l.sw 0(r4), r0
+ l.sfltu r4,r5
+ l.bf .L_clear_bss
+ l.addi r4,r4,4
+
+ /* Reset registers before jumping to board_init */
+ l.andi r3, r0, 0
+ l.andi r4, r0, 0
+ l.andi r5, r0, 0
+ l.andi r6, r0, 0
+ l.andi r7, r0, 0
+ l.andi r8, r0, 0
+ l.andi r9, r0, 0
+ l.andi r10, r0, 0
+ l.andi r11, r0, 0
+ l.andi r12, r0, 0
+ l.andi r13, r0, 0
+ l.andi r14, r0, 0
+ l.andi r15, r0, 0
+ l.andi r17, r0, 0
+ l.andi r18, r0, 0
+ l.andi r19, r0, 0
+ l.andi r20, r0, 0
+ l.andi r21, r0, 0
+ l.andi r22, r0, 0
+ l.andi r23, r0, 0
+ l.andi r24, r0, 0
+ l.andi r25, r0, 0
+ l.andi r26, r0, 0
+ l.andi r27, r0, 0
+ l.andi r28, r0, 0
+ l.andi r29, r0, 0
+ l.andi r30, r0, 0
+ l.andi r31, r0, 0
+
+ l.j board_init
+ l.nop
+
+ .size _start, .-_start
+
+/*
+ * Store state onto stack and call the real exception handler
+ */
+ .section .text
+ .extern exception_handler
+ .type _exception_handler, at function
+
+_exception_handler:
+ /* Store state (r9 already saved)*/
+ l.sw 0x00(r1), r2
+ l.sw 0x04(r1), r3
+ l.sw 0x08(r1), r4
+ l.sw 0x0c(r1), r5
+ l.sw 0x10(r1), r6
+ l.sw 0x14(r1), r7
+ l.sw 0x18(r1), r8
+ l.sw 0x20(r1), r10
+ l.sw 0x24(r1), r11
+ l.sw 0x28(r1), r12
+ l.sw 0x2c(r1), r13
+ l.sw 0x30(r1), r14
+ l.sw 0x34(r1), r15
+ l.sw 0x38(r1), r16
+ l.sw 0x3c(r1), r17
+ l.sw 0x40(r1), r18
+ l.sw 0x44(r1), r19
+ l.sw 0x48(r1), r20
+ l.sw 0x4c(r1), r21
+ l.sw 0x50(r1), r22
+ l.sw 0x54(r1), r23
+ l.sw 0x58(r1), r24
+ l.sw 0x5c(r1), r25
+ l.sw 0x60(r1), r26
+ l.sw 0x64(r1), r27
+ l.sw 0x68(r1), r28
+ l.sw 0x6c(r1), r29
+ l.sw 0x70(r1), r30
+ l.sw 0x74(r1), r31
+
+ /* Save return address */
+ l.or r14, r0, r9
+ /* Call exception handler with the link address as argument */
+ l.jal exception_handler
+ l.or r3, r0, r14
+ /* Load return address */
+ l.or r9, r0, r14
+
+ /* Restore state */
+ l.lwz r2, 0x00(r1)
+ l.lwz r3, 0x04(r1)
+ l.lwz r4, 0x08(r1)
+ l.lwz r5, 0x0c(r1)
+ l.lwz r6, 0x10(r1)
+ l.lwz r7, 0x14(r1)
+ l.lwz r8, 0x18(r1)
+ l.lwz r10, 0x20(r1)
+ l.lwz r11, 0x24(r1)
+ l.lwz r12, 0x28(r1)
+ l.lwz r13, 0x2c(r1)
+ l.lwz r14, 0x30(r1)
+ l.lwz r15, 0x34(r1)
+ l.lwz r16, 0x38(r1)
+ l.lwz r17, 0x3c(r1)
+ l.lwz r18, 0x40(r1)
+ l.lwz r19, 0x44(r1)
+ l.lwz r20, 0x48(r1)
+ l.lwz r21, 0x4c(r1)
+ l.lwz r22, 0x50(r1)
+ l.lwz r23, 0x54(r1)
+ l.lwz r24, 0x58(r1)
+ l.lwz r25, 0x5c(r1)
+ l.lwz r26, 0x60(r1)
+ l.lwz r27, 0x64(r1)
+ l.lwz r28, 0x68(r1)
+ l.lwz r29, 0x6c(r1)
+ l.lwz r30, 0x70(r1)
+ l.lwz r31, 0x74(r1)
+ l.jr r9
+ l.nop
--
1.7.5.4
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