Linux-2.6.12-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!
diff --git a/arch/ppc/boot/simple/head.S b/arch/ppc/boot/simple/head.S
new file mode 100644
index 0000000..5240532
--- /dev/null
+++ b/arch/ppc/boot/simple/head.S
@@ -0,0 +1,142 @@
+/*
+ * arch/ppc/boot/simple/head.S
+ *
+ * Initial board bringup code for many different boards.
+ *
+ * Author: Tom Rini
+ * trini@mvista.com
+ * Derived from arch/ppc/boot/prep/head.S (Cort Dougan, many others).
+ *
+ * 2001-2004 (c) MontaVista, Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/config.h>
+#include <asm/reg.h>
+#include <asm/cache.h>
+#include <asm/ppc_asm.h>
+
+ .text
+
+/*
+ * Begin at some arbitrary location in RAM or Flash
+ * Initialize core registers
+ * Configure memory controller (Not executing from RAM)
+ * Move the boot code to the link address (8M)
+ * Setup C stack
+ * Initialize UART
+ * Decompress the kernel to 0x0
+ * Jump to the kernel entry
+ *
+ */
+
+ .globl start
+start:
+ bl start_
+#ifdef CONFIG_IBM_OPENBIOS
+ /* The IBM "Tree" bootrom knows that the address of the bootrom
+ * read only structure is 4 bytes after _start.
+ */
+ .long 0x62726f6d # structure ID - "brom"
+ .long 0x5f726f00 # - "_ro\0"
+ .long 1 # structure version
+ .long bootrom_cmdline # address of *bootrom_cmdline
+#endif
+
+start_:
+#ifdef CONFIG_FORCE
+ /* We have some really bad firmware. We must disable the L1
+ * icache/dcache now or the board won't boot.
+ */
+ li r4,0x0000
+ isync
+ mtspr SPRN_HID0,r4
+ sync
+ isync
+#endif
+
+#if defined(CONFIG_MBX) || defined(CONFIG_RPX8260) || defined(CONFIG_PPC_PREP)
+ mr r29,r3 /* On the MBX860, r3 is the board info pointer.
+ * On the RPXSUPER, r3 points to the NVRAM
+ * configuration keys.
+ * On PReP, r3 is the pointer to the residual data.
+ */
+#endif
+
+ mflr r3 /* Save our actual starting address. */
+
+ /* The following functions we call must not modify r3 or r4.....
+ */
+#ifdef CONFIG_6xx
+ /* On PReP we must look at the OpenFirmware pointer and sanity
+ * test it. On other platforms, we disable the MMU right now
+ * and other bits.
+ */
+#ifdef CONFIG_PPC_PREP
+/*
+ * Save the OF pointer to r25, but only if the entry point is in a sane
+ * location; if not we store 0. If there is no entry point, or it is
+ * invalid, we establish the default MSR value immediately. Otherwise,
+ * we defer doing that, to allow OF functions to be called, until we
+ * begin uncompressing the kernel.
+ */
+ lis r8,0x0fff /* r8 = 0x0fffffff */
+ ori r8,r8,0xffff
+
+ subc r8,r8,r5 /* r8 = (r5 <= r8) ? ~0 : 0 */
+ subfe r8,r8,r8
+ nand r8,r8,r8
+
+ and. r5,r5,r8 /* r5 will be cleared if (r5 > r8) */
+ bne+ haveOF
+
+ li r8,MSR_IP|MSR_FP /* Not OF: set MSR immediately */
+ mtmsr r8
+ isync
+haveOF:
+ mr r25,r5
+#else
+ bl disable_6xx_mmu
+#endif
+ bl disable_6xx_l1cache
+
+ CLEAR_CACHES
+#endif
+
+#ifdef CONFIG_8xx
+ mfmsr r8 /* Turn off interrupts */
+ li r9,0
+ ori r9,r9,MSR_EE
+ andc r8,r8,r9
+ mtmsr r8
+
+ /* We do this because some boot roms don't initialize the
+ * processor correctly. Don't do this if you want to debug
+ * using a BDM device.
+ */
+ li r4,0 /* Zero DER to prevent FRZ */
+ mtspr SPRN_DER,r4
+#endif
+
+#ifdef CONFIG_REDWOOD_4
+ /* All of this Redwood 4 stuff will soon disappear when the
+ * boot rom is straightened out.
+ */
+ mr r29, r3 /* Easier than changing the other code */
+ bl HdwInit
+ mr r3, r29
+#endif
+
+#if defined(CONFIG_MBX) || defined(CONFIG_RPX8260) || defined(CONFIG_PPC_PREP)
+ mr r4,r29 /* put the board info pointer where the relocate
+ * routine will find it
+ */
+#endif
+
+ /* Get the load address.
+ */
+ subi r3, r3, 4 /* Get the actual IP, not NIP */
+ b relocate
+