add boot-helper.S etc from microwatt litex core

diff --git a/src/soc/litex/boot-helper.S b/src/soc/litex/boot-helper.S
new file mode 100644 (file)
index 0000000..8dc226d
--- /dev/null
+++ b/src/soc/litex/boot-helper.S
@@ -0,0 +1,4 @@
+.section    .text, "ax", @progbits
+.global     boot_helper
+boot_helper:
+       nop # FIXME

diff --git a/src/soc/litex/crt0.S b/src/soc/litex/crt0.S
new file mode 100644 (file)
index 0000000..e03ac0b
--- /dev/null
+++ b/src/soc/litex/crt0.S
@@ -0,0 +1,93 @@
+/* Copyright 2013-2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define FIXUP_ENDIAN                                              \
+       tdi   0,0,0x48;   /* Reverse endian of b . + 8          */ \
+       b     191f;       /* Skip trampoline if endian is good  */ \
+       .long 0xa600607d; /* mfmsr r11                          */ \
+       .long 0x01006b69; /* xori r11,r11,1                     */ \
+       .long 0x05009f42; /* bcl 20,31,$+4                      */ \
+       .long 0xa602487d; /* mflr r10                           */ \
+       .long 0x14004a39; /* addi r10,r10,20                    */ \
+       .long 0xa64b5a7d; /* mthsrr0 r10                        */ \
+       .long 0xa64b7b7d; /* mthsrr1 r11                        */ \
+       .long 0x2402004c; /* hrfid                              */ \
+191:
+
+
+/* Load an immediate 64-bit value into a register */
+#define LOAD_IMM64(r, e)                       \
+       lis     r,(e)@highest;                  \
+       ori     r,r,(e)@higher;                 \
+       rldicr  r,r, 32, 31;                    \
+       oris    r,r, (e)@h;                     \
+       ori     r,r, (e)@l;
+
+       . = 0
+.global _start
+_start:
+       FIXUP_ENDIAN
+
+       /* setup stack */
+       LOAD_IMM64(%r1, _fstack - 0x100)
+       LOAD_IMM64(%r12, main)
+       mtctr   %r12,
+       bctrl
+       b .
+
+#define EXCEPTION(nr)          \
+       .=  nr;      \
+       b       .
+
+       /* More exception stubs */
+       EXCEPTION(0x100)
+       EXCEPTION(0x200)
+       EXCEPTION(0x300)
+       EXCEPTION(0x380)
+       EXCEPTION(0x400)
+       EXCEPTION(0x480)
+       EXCEPTION(0x500)
+       EXCEPTION(0x600)
+       EXCEPTION(0x700)
+       EXCEPTION(0x800)
+       EXCEPTION(0x900)
+       EXCEPTION(0x980)
+       EXCEPTION(0xa00)
+       EXCEPTION(0xb00)
+       EXCEPTION(0xc00)
+       EXCEPTION(0xd00)
+       EXCEPTION(0xe00)
+       EXCEPTION(0xe20)
+       EXCEPTION(0xe40)
+       EXCEPTION(0xe60)
+       EXCEPTION(0xe80)
+       EXCEPTION(0xf00)
+       EXCEPTION(0xf20)
+       EXCEPTION(0xf40)
+       EXCEPTION(0xf60)
+       EXCEPTION(0xf80)
+#if 0
+       EXCEPTION(0x1000)
+       EXCEPTION(0x1100)
+       EXCEPTION(0x1200)
+       EXCEPTION(0x1300)
+       EXCEPTION(0x1400)
+       EXCEPTION(0x1500)
+       EXCEPTION(0x1600)
+#endif
+
+       .text
+

diff --git a/src/soc/litex/irq.h b/src/soc/litex/irq.h
new file mode 100644 (file)
index 0000000..7374cf5
--- /dev/null
+++ b/src/soc/litex/irq.h
@@ -0,0 +1,4 @@
+#ifndef __IRQ_H
+#define __IRQ_H
+
+#endif /* __IRQ_H */

diff --git a/src/soc/litex/sim.py b/src/soc/litex/sim.py
index cfdc0f8b3f33906054f51abb896a90c6defaf63f..9640c58a963d156b1289016ce3a410fb3413c547 100644 (file)
--- a/src/soc/litex/sim.py
+++ b/src/soc/litex/sim.py
@@ -63,7 +63,7 @@ class SoCSMP(SoCCore):
 
         # SoCCore --------------------------------------------------------
         SoCCore.__init__(self, platform, clk_freq=sys_clk_freq,
-            cpu_type                 = "None", # XXX use None for now libre_soc
+            cpu_type                 = "microwatt", # XXX use None for now libre_soc
             cpu_variant              = cpu_variant,
             cpu_cls                  = LibreSOC,
             uart_name                = "sim",

diff --git a/src/soc/litex/system.h b/src/soc/litex/system.h
new file mode 100644 (file)
index 0000000..941dc56
--- /dev/null
+++ b/src/soc/litex/system.h
@@ -0,0 +1,18 @@
+#ifndef __SYSTEM_H
+#define __SYSTEM_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+__attribute__((unused)) static void flush_cpu_icache(void){}; /* FIXME: do something useful here! */
+__attribute__((unused)) static void flush_cpu_dcache(void){}; /* FIXME: do something useful here! */
+void flush_l2_cache(void);
+
+void busy_wait(unsigned int ms);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SYSTEM_H */