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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/boot/compressed/head-clps7500.S
downloadconfigs-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/boot/compressed/head-clps7500.S')
-rw-r--r--arch/arm/boot/compressed/head-clps7500.S87
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/arm/boot/compressed/head-clps7500.S b/arch/arm/boot/compressed/head-clps7500.S
new file mode 100644
index 00000000000..4a8a689d15e
--- /dev/null
+++ b/arch/arm/boot/compressed/head-clps7500.S
@@ -0,0 +1,87 @@
+/*
+ * linux/arch/arm/boot/compressed/head.S
+ *
+ * Copyright (C) 1999, 2000, 2001 Nexus Electronics Ltd
+ */
+
+#include <linux/config.h>
+
+ /* There are three different ways the kernel can be
+ booted on a 7500 system: from Angel (loaded in RAM), from
+ 16-bit ROM or from 32-bit Flash. Luckily, a single kernel
+ image does for them all. */
+ /* This branch is taken if the CPU memory width matches the
+ actual device in use. The default at power on is 16 bits
+ so we must be prepared for a mismatch. */
+ .section ".start", "ax"
+2:
+ b 1f
+ .word 0xffff
+ .word 0xb632 @ mov r11, #0x03200000
+ .word 0xe3a0
+ .word 0x0000 @ mov r0, #0
+ .word 0xe3a0
+ .word 0x0080 @ strb r0, [r11, #0x80]
+ .word 0xe5cb
+ .word 0xf000 @ mov pc, #0
+ .word 0xe3a0
+1:
+ adr r1, 2b
+ teq r1, #0
+ bne .Langel
+ /* This is a direct-from-ROM boot. Copy the kernel into
+ RAM and run it there. */
+ mov r0, #0x30
+ mcr p15, 0, r0, c1, c0, 0
+ mov r0, #0x13
+ msr cpsr_cxsf, r0
+ mov r12, #0x03000000 @ point to LEDs
+ orr r12, r12, #0x00020000
+ orr r12, r12, #0xba00
+ mov r0, #0x5500
+ str r0, [r12]
+ mov r0, #0x10000000
+ orr r0, r0, #0x8000
+ mov r4, r0
+ ldr r2, =_end
+2:
+ ldr r3, [r1], #4
+ str r3, [r0], #4
+ teq r0, r2
+ bne 2b
+ mov r0, #0xff00
+ str r0, [r12]
+1:
+ mov r12, #0x03000000 @ point to LEDs
+ orr r12, r12, #0x00020000
+ orr r12, r12, #0xba00
+ mov r0, #0xfe00
+ str r0, [r12]
+
+ adr lr, 1f
+ mov r0, #0
+ mov r1, #14 /* MACH_TYPE_CLPS7500 */
+ mov pc, lr
+.Langel:
+#ifdef CONFIG_ANGELBOOT
+ /* Call Angel to switch into SVC mode. */
+ mov r0, #0x17
+ swi 0x123456
+#endif
+ /* Ensure all interrupts are off and MMU disabled */
+ mrs r0, cpsr
+ orr r0, r0, #0xc0
+ msr cpsr_cxsf, r0
+
+ adr lr, 1b
+ orr lr, lr, #0x10000000
+ mov r0, #0x30 @ MMU off
+ mcr p15, 0, r0, c1, c0, 0
+ mov r0, r0
+ mov pc, lr
+
+ .ltorg
+
+1:
+/* And the rest */
+#include "head.S"