palacios/src/palacios/svm_lowlevel.S

   1 #;  -*- fundamental -*-
   2
   3
   4 .text
   5 .align 4
   6
   7 .globl v3_svm_launch
   8 .globl v3_stgi
   9 .globl v3_clgi
  10
  11 #define SVM_ERROR .dword 0xffffffff
  12 #define SVM_SUCCESS .dword 0x00000000
  13
  14 #define vmrun .byte 0x0f,0x01,0xd8
  15 #define vmload .byte 0x0F,0x01,0xDA
  16 #define vmsave .byte 0x0F,0x01,0xDB
  17 #define stgi   .byte 0x0F,0x01,0xDC
  18 #define clgi   .byte 0x0F,0x01,0xDD
  19
  20
  21 #ifdef __V3_32BIT__
  22
  23 #define Save_SVM_Registers(location)    \
  24         pushl   %eax;                   \
  25         movl    location, %eax;         \
  26         movl    %edi, (%eax);           \
  27         movl    %esi, 8(%eax);          \
  28         movl    %ebp, 16(%eax);         \
  29         movl    $0, 24(%eax);           \
  30         movl    %ebx, 32(%eax);         \
  31         movl    %edx, 40(%eax);         \
  32         movl    %ecx, 48(%eax);         \
  33         pushl   %ebx;                   \
  34         movl    4(%esp), %ebx;          \
  35         movl    %ebx, 56(%eax);         \
  36         popl    %ebx;                   \
  37         popl    %eax;
  38
  39
  40 #define Restore_SVM_Registers(location) \
  41         pushl   %eax;                   \
  42         movl    location, %eax;         \
  43         movl    (%eax), %edi;           \
  44         movl    8(%eax), %esi;          \
  45         movl    16(%eax), %ebp;         \
  46         movl    32(%eax), %ebx;         \
  47         movl    40(%eax), %edx;         \
  48         movl    48(%eax), %ecx;         \
  49         popl    %eax;
  50
  51
  52
  53 #elif __V3_64BIT__
  54
  55 #endif
  56
  57
  58 v3_stgi:
  59         stgi;
  60         ret;
  61
  62 v3_clgi:
  63         clgi;
  64         ret;
  65
  66
  67 v3_svm_launch:
  68         push    %ebp;
  69         movl    %esp, %ebp;
  70         pushf;
  71         push    %fs;
  72         push    %gs;
  73         pusha;
  74
  75         pushl   12(%ebp);
  76         pushl   8(%ebp);
  77
  78         Restore_SVM_Registers(8(%esp));
  79         popl    %eax;
  80
  81         vmload;
  82         vmrun;
  83         vmsave;
  84
  85         Save_SVM_Registers(4(%esp));
  86
  87         addl    $4, %esp;
  88
  89         popa;
  90         pop     %gs;
  91         pop     %fs;
  92         popf;
  93         pop     %ebp;
  94         ret