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, 115 insertions, 0 deletions

diff --git a/arch/arm/boot/compressed/head-shark.S b/arch/arm/boot/compressed/head-shark.S
new file mode 100644
index 000000000000..848f60e5429b
--- /dev/null
+++ b/arch/arm/boot/compressed/head-shark.S
@@ -0,0 +1,115 @@
+/* The head-file for the Shark
+ * by Alexander Schulz
+ *
+ * Does the following:
+ * - get the memory layout from firmware. This can only be done as long as the mmu
+ *   is still on.
+ * - switch the mmu off, so we have physical addresses
+ * - copy the kernel to 0x08508000. This is done to have a fixed address where the
+ *   C-parts (misc.c) are executed. This address must be known at compile-time,
+ *   but the load-address of the kernel depends on how much memory is installed.
+ * - Jump to this location.
+ * - Set r8 with 0, r7 with the architecture ID for head.S
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+        
+                .section        ".start", "ax"
+
+                b       __beginning
+        
+__ofw_data:     .long   0                               @ the number of memory blocks
+                .space  128                             @ (startaddr,size) ...
+                .space  128                             @ bootargs
+                .align
+
+__beginning:    mov     r4, r0                          @ save the entry to the firmware
+
+                mov     r0, #0xC0                       @ disable irq and fiq
+                mov     r1, r0
+                mrs     r3, cpsr
+                bic     r2, r3, r0
+                eor     r2, r2, r1
+                msr     cpsr_c, r2
+
+                mov     r0, r4                          @ get the Memory layout from firmware
+                adr     r1, __ofw_data
+                add     r2, r1, #4
+                mov     lr, pc
+                b       ofw_init
+                mov     r1, #0
+
+                adr     r2, __mmu_off                   @ calculate physical address
+                sub     r2, r2, #0xf0000000             @ openprom maps us at f000 virt, 0e50 phys
+                adr     r0, __ofw_data
+                ldr     r0, [r0, #4]
+                add     r2, r2, r0
+                add     r2, r2, #0x00500000
+
+                mrc     p15, 0, r3, c1, c0
+                bic     r3, r3, #0xC                    @ Write Buffer and DCache
+                bic     r3, r3, #0x1000                 @ ICache
+                mcr     p15, 0, r3, c1, c0              @ disabled
+
+                mov     r0, #0
+                mcr     p15, 0, r0, c7, c7              @ flush I,D caches on v4
+                mcr     p15, 0, r0, c7, c10, 4          @ drain write buffer on v4
+                mcr     p15, 0, r0, c8, c7              @ flush I,D TLBs on v4
+
+                bic     r3, r3, #0x1                    @ MMU
+                mcr     p15, 0, r3, c1, c0              @ disabled
+
+                mov     pc, r2
+
+__copy_target:  .long   0x08508000
+__copy_end:     .long   0x08608000
+                
+                .word   _start
+                .word   __bss_start
+
+                .align
+__temp_stack:   .space 128
+
+__mmu_off:
+                adr     r0, __ofw_data
+                ldr     r0, [r0, #4]
+                orr     r0, r0, #0x00600000
+        
+                ldr     r1, __copy_end
+                ldr     r3, __copy_target
+
+/* r0 = 0x0e600000 (current end of kernelcode)
+ * r3 = 0x08508000 (where it should begin)
+ * r1 = 0x08608000 (end of copying area, 1MB)
+ * The kernel is compressed, so 1 MB should be enough.
+ * copy the kernel to the beginning of physical memory
+ * We start from the highest address, so we can copy
+ * from 0x08500000 to 0x08508000 if we have only 8MB
+ */
+
+        
+__Copy:         ldr     r2, [r0], #-4
+                str     r2, [r1], #-4
+                teq     r1, r3
+                bne     __Copy
+                /* and jump to it */
+                adr     r2, __go_on
+                adr     r0, __ofw_data
+                ldr     r0, [r0, #4]
+                sub     r2, r2, r0
+                sub     r2, r2, #0x00500000
+                ldr     r0, __copy_target
+                add     r2, r2, r0
+                mov     pc, r2
+
+__go_on:
+                adr     sp, __temp_stack
+                add     sp, sp, #128
+                adr     r0, __ofw_data
+                mov     lr, pc
+                b       create_params
+        
+                mov     r8, #0
+                mov     r7, #15