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!

1 files changed, 142 insertions, 0 deletions

diff --git a/arch/ppc/boot/simple/head.S b/arch/ppc/boot/simple/head.S
new file mode 100644
index 000000000000..524053202bb4
--- /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
+