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, 147 insertions, 0 deletions

diff --git a/arch/ppc/kernel/softemu8xx.c b/arch/ppc/kernel/softemu8xx.c
new file mode 100644
index 000000000000..9bbb6bf7b645
--- /dev/null
+++ b/arch/ppc/kernel/softemu8xx.c
@@ -0,0 +1,147 @@
+/*
+ * Software emulation of some PPC instructions for the 8xx core.
+ *
+ * Copyright (C) 1998 Dan Malek (dmalek@jlc.net)
+ *
+ * Software floating emuation for the MPC8xx processor.  I did this mostly
+ * because it was easier than trying to get the libraries compiled for
+ * software floating point.  The goal is still to get the libraries done,
+ * but I lost patience and needed some hacks to at least get init and
+ * shells running.  The first problem is the setjmp/longjmp that save
+ * and restore the floating point registers.
+ *
+ * For this emulation, our working registers are found on the register
+ * save area.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/interrupt.h>
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+
+extern void
+print_8xx_pte(struct mm_struct *mm, unsigned long addr);
+extern int
+get_8xx_pte(struct mm_struct *mm, unsigned long addr);
+
+/* Eventually we may need a look-up table, but this works for now.
+*/
+#define LFS     48
+#define LFD     50
+#define LFDU    51
+#define STFD    54
+#define STFDU   55
+#define FMR     63
+
+/*
+ * We return 0 on success, 1 on unimplemented instruction, and EFAULT
+ * if a load/store faulted.
+ */
+int
+Soft_emulate_8xx(struct pt_regs *regs)
+{
+        uint    inst, instword;
+        uint    flreg, idxreg, disp;
+        uint    retval;
+        signed short sdisp;
+        uint    *ea, *ip;
+
+        retval = 0;
+
+        instword = *((uint *)regs->nip);
+        inst = instword >> 26;
+
+        flreg = (instword >> 21) & 0x1f;
+        idxreg = (instword >> 16) & 0x1f;
+        disp = instword & 0xffff;
+
+        ea = (uint *)(regs->gpr[idxreg] + disp);
+        ip = (uint *)&current->thread.fpr[flreg];
+
+        switch ( inst )
+        {
+        case LFD:
+                /* this is a 16 bit quantity that is sign extended
+                 * so use a signed short here -- Cort
+                 */
+                sdisp = (instword & 0xffff);
+                ea = (uint *)(regs->gpr[idxreg] + sdisp);
+                if (copy_from_user(ip, ea, sizeof(double)))
+                        retval = -EFAULT;
+                break;
+                
+        case LFDU:
+                if (copy_from_user(ip, ea, sizeof(double)))
+                        retval = -EFAULT;
+                else
+                        regs->gpr[idxreg] = (uint)ea;
+                break;
+        case LFS:
+                sdisp = (instword & 0xffff);
+                ea = (uint *)(regs->gpr[idxreg] + sdisp);
+                if (copy_from_user(ip, ea, sizeof(float)))
+                        retval = -EFAULT;
+                break;
+        case STFD:
+                /* this is a 16 bit quantity that is sign extended
+                 * so use a signed short here -- Cort
+                 */
+                sdisp = (instword & 0xffff);
+                ea = (uint *)(regs->gpr[idxreg] + sdisp);
+                if (copy_to_user(ea, ip, sizeof(double)))
+                        retval = -EFAULT;
+                break;
+
+        case STFDU:
+                if (copy_to_user(ea, ip, sizeof(double)))
+                        retval = -EFAULT;
+                else
+                        regs->gpr[idxreg] = (uint)ea;
+                break;
+        case FMR:
+                /* assume this is a fp move -- Cort */
+                memcpy( ip, &current->thread.fpr[(instword>>11)&0x1f],
+                        sizeof(double) );
+                break;
+        default:
+                retval = 1;
+                printk("Bad emulation %s/%d\n"
+                       " NIP: %08lx instruction: %08x opcode: %x "
+                       "A: %x B: %x C: %x code: %x rc: %x\n",
+                       current->comm,current->pid,
+                       regs->nip,
+                       instword,inst,
+                       (instword>>16)&0x1f,
+                       (instword>>11)&0x1f,
+                       (instword>>6)&0x1f,
+                       (instword>>1)&0x3ff,
+                       instword&1);
+                {
+                        int pa;
+                        print_8xx_pte(current->mm,regs->nip);
+                        pa = get_8xx_pte(current->mm,regs->nip) & PAGE_MASK;
+                        pa |= (regs->nip & ~PAGE_MASK);
+                        pa = (unsigned long)__va(pa);
+                        printk("Kernel VA for NIP %x ", pa);
+                        print_8xx_pte(current->mm,pa);
+                }
+                
+        }
+
+        if (retval == 0)
+                regs->nip += 4;
+        return(retval);
+}
+