[Xen-changelog] [xen-unstable] [MINIOS][IA64] mini-os without linux-optimization in hypervisor

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1182896681 21600
# Node ID 1fd90169f268f1eec6d0f18fb1b731624ec8fffa
# Parent  2a7339251e4db9fda18c249651d958d651906a69
[MINIOS][IA64] mini-os without linux-optimization in hypervisor

Make mini-os runnable again without the special linux optimization for the
identity mapping in the hypervisor.

Signed-off-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>
---
 extras/mini-os/arch/ia64/ia64.S        |    7 +++-
 extras/mini-os/arch/ia64/ivt.S         |   49 ++++++++++++++++++---------------
 extras/mini-os/include/ia64/ia64_cpu.h |    4 +-
 3 files changed, 35 insertions(+), 25 deletions(-)

diff -r 2a7339251e4d -r 1fd90169f268 extras/mini-os/arch/ia64/ia64.S
--- a/extras/mini-os/arch/ia64/ia64.S   Tue Jun 26 16:18:28 2007 -0600
+++ b/extras/mini-os/arch/ia64/ia64.S   Tue Jun 26 16:24:41 2007 -0600
@@ -105,7 +105,7 @@ ENTRY(_start)
        /*
         * Now pin mappings into the TLB for kernel text and data
         */
-       mov     r18=KERNEL_TR_PAGE_SIZE<<2
+       mov     r18=KERNEL_TR_PAGE_SIZE<<IA64_ITIR_PS
        movl    r17=KERNEL_START
        ;;
        mov     cr.itir=r18
@@ -204,7 +204,10 @@ 1: /* now we are in virtual mode */
        ;;
        or      out0=r16, r15                   // make a region 7 address
        ;;
-
+       ssm     psr.i | psr.ic
+       ;;
+       srlz.i
+       ;;
        br.call.sptk.many rp=start_kernel
        ;;
        add     r2=3,r0
diff -r 2a7339251e4d -r 1fd90169f268 extras/mini-os/arch/ia64/ivt.S
--- a/extras/mini-os/arch/ia64/ivt.S    Tue Jun 26 16:18:28 2007 -0600
+++ b/extras/mini-os/arch/ia64/ivt.S    Tue Jun 26 16:24:41 2007 -0600
@@ -587,13 +587,11 @@ END(save_special_regs)
 
 
 ENTRY(hypervisor_callback)
-               // Calculate the stack address for storing.
-               // Use the kernel stack here because it's mapped wired!
-               // -> no nested tlb faults!
-       movl    r18=kstack+KSTACK_PAGES * PAGE_SIZE - 16 - TF_SIZE
-
-       //add   r18=-TF_SIZE,sp
-       add     r30=0xabab,r0
+       /*
+        * Use the thread stack here for storing the trap frame.
+        * It's not wired mapped, so nested data tlb faults may occur!
+        */
+       add     r18=-TF_SIZE,sp
        ;;
 {      .mib
        nop     0x02
@@ -602,7 +600,7 @@ ENTRY(hypervisor_callback)
        ;;
 }
        add     sp=-16,r18              // the new stack
-       alloc   r15=ar.pfs,0,0,1,0      // 1 out for do_trap_error
+       alloc   r15=ar.pfs,0,0,1,0      // 1 out for do_hypervisor_callback
        ;;
        mov     out0=r18                // the trap frame
        movl    r22=XSI_PSR_IC
@@ -617,13 +615,8 @@ ENTRY(hypervisor_callback)
        movl    r22=XSI_PSR_IC
        ;;
        st4     [r22]=r0                // rsm psr.ic
-
-       add     r16=16,sp               // load EF-pointer again
-       ;;
-       //mov   r18=sp
-       movl    r18=kstack+KSTACK_PAGES * PAGE_SIZE - 16 - TF_SIZE
-       ;;
-
+       add     r18=16,sp               // load EF-pointer again
+       ;;
                        // must have r18-efp, calls rfi at the end.
        br.sptk restore_tf_rse_switch
        ;;
@@ -654,9 +647,7 @@ ENTRY(trap_error)
        mov     out0=r18                // the trap frame
        add     sp=-16,r18              // C-call abi
        ;;
-
-       //bsw.1
-       movl r30=XSI_BANKNUM
+       movl r30=XSI_BANKNUM            // bsw.1
        mov r31=1;;
 #if defined(BIG_ENDIAN)                        // swap because mini-os is in BE
        mux1    r31=r31,@rev;;
@@ -752,6 +743,7 @@ IVT_ERR(Alternate_Instruction_TLB, 3, 0x
 
 IVT_ENTRY(Alternate_Data_TLB, 0x1000)
        mov     r30=4                   // trap number
+adt_common:
        mov     r16=cr.ifa              // where did it happen
        mov     r31=pr                  // save predicates
        ;;
@@ -765,7 +757,7 @@ IVT_ENTRY(Alternate_Data_TLB, 0x1000)
 //             // No return
 //
 //adt_regf_addr:
-//     extr.u  r17=r16,60,4    // get region number
+//     extr.u  r17=r16,60,4            // get region number
 //     ;;
 //     cmp.eq  p14,p15=0xf,r17
 //     ;;
@@ -799,8 +791,23 @@ adt_reg7_addr:
 
 IVT_END(Alternate_Data_TLB)
 
-
-IVT_ERR(Data_Nested_TLB, 5, 0x1400)
+/*
+ * Handling of nested data tlb is needed, because in hypervisor_callback()
+ * the stack is used to store the register trap frame. This stack is allocated
+ * dynamically (as identity mapped address) and therewidth no tr mapped page!
+ */
+IVT_ENTRY(Data_Nested_TLB, 0x1400)
+
+       mov     r30=5                   // trap number
+       add     r28=-TF_SIZE,sp         // r28 is never used in trap handling
+       ;;
+       mov     cr.ifa=r28
+       ;;
+       br.sptk adt_common
+IVT_END(Data_Nested_TLB)
+
+
+
 IVT_ERR(Instruction_Key_Miss, 6, 0x1800)
 IVT_ERR(Data_Key_Miss, 7, 0x1c00)
 IVT_ERR(Dirty_Bit, 8, 0x2000)
diff -r 2a7339251e4d -r 1fd90169f268 extras/mini-os/include/ia64/ia64_cpu.h
--- a/extras/mini-os/include/ia64/ia64_cpu.h    Tue Jun 26 16:18:28 2007 -0600
+++ b/extras/mini-os/include/ia64/ia64_cpu.h    Tue Jun 26 16:24:41 2007 -0600
@@ -143,11 +143,11 @@
 
 #define STARTUP_PSR (IA64_PSR_IT | \
                     IA64_PSR_DT | IA64_PSR_RT | MOS_IA64_PSR_BE | \
-                    IA64_PSR_BN | IA64_PSR_CPL_2 | IA64_PSR_AC)
+                    IA64_PSR_BN | IA64_PSR_CPL_KERN | IA64_PSR_AC)
 
 #define MOS_SYS_PSR (IA64_PSR_IC | IA64_PSR_I | IA64_PSR_IT | \
                     IA64_PSR_DT | IA64_PSR_RT | MOS_IA64_PSR_BE | \
-                    IA64_PSR_BN | IA64_PSR_CPL_2 | IA64_PSR_AC)
+                    IA64_PSR_BN | IA64_PSR_CPL_KERN | IA64_PSR_AC)
 
 #define MOS_USR_PSR (IA64_PSR_IC | IA64_PSR_I | IA64_PSR_IT | \
                     IA64_PSR_DT | IA64_PSR_RT | MOS_IA64_PSR_BE | \

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