pc-bios/bios-pq/0002_e820-high-mem.patch

   1 From: Izik Eidus <izike@qumranet.com>
   2
   3 add support to memory above the pci hole
   4
   5 the new memory region is mapped after address 0x100000000,
   6 the bios take the size of the memory after the 0x100000000 from
   7 three new cmos bytes.
   8
   9 diff --git a/bios/rombios.c b/bios/rombios.c
  10 index 1be0816..b70f249 100644
  11 --- a/bios/rombios.c
  12 +++ b/bios/rombios.c
  13 @@ -4442,22 +4442,25 @@ BX_DEBUG_INT15("case default:\n");
  14  #endif // BX_USE_PS2_MOUSE
  15
  16
  17 -void set_e820_range(ES, DI, start, end, type)
  18 +void set_e820_range(ES, DI, start, end, extra_start, extra_end, type)
  19       Bit16u ES;
  20       Bit16u DI;
  21       Bit32u start;
  22       Bit32u end;
  23 +     Bit8u extra_start;
  24 +     Bit8u extra_end;
  25       Bit16u type;
  26  {
  27      write_word(ES, DI, start);
  28      write_word(ES, DI+2, start >> 16);
  29 -    write_word(ES, DI+4, 0x00);
  30 +    write_word(ES, DI+4, extra_start);
  31      write_word(ES, DI+6, 0x00);
  32
  33      end -= start;
  34 +    extra_end -= extra_start;
  35      write_word(ES, DI+8, end);
  36      write_word(ES, DI+10, end >> 16);
  37 -    write_word(ES, DI+12, 0x0000);
  38 +    write_word(ES, DI+12, extra_end);
  39      write_word(ES, DI+14, 0x0000);
  40
  41      write_word(ES, DI+16, type);
  42 @@ -4470,7 +4473,9 @@ int15_function32(regs, ES, DS, FLAGS)
  43    Bit16u ES, DS, FLAGS;
  44  {
  45    Bit32u  extended_memory_size=0; // 64bits long
  46 +  Bit32u  extra_lowbits_memory_size=0;
  47    Bit16u  CX,DX;
  48 +  Bit8u   extra_highbits_memory_size=0;
  49
  50  BX_DEBUG_INT15("int15 AX=%04x\n",regs.u.r16.ax);
  51
  52 @@ -4544,11 +4549,18 @@ ASM_END
  53                      extended_memory_size += (1L * 1024 * 1024);
  54                  }
  55
  56 +                extra_lowbits_memory_size = inb_cmos(0x5c);
  57 +                extra_lowbits_memory_size <<= 8;
  58 +                extra_lowbits_memory_size |= inb_cmos(0x5b);
  59 +                extra_lowbits_memory_size *= 64;
  60 +                extra_lowbits_memory_size *= 1024;
  61 +                extra_highbits_memory_size = inb_cmos(0x5d);
  62 +
  63                  switch(regs.u.r16.bx)
  64                  {
  65                      case 0:
  66                          set_e820_range(ES, regs.u.r16.di,
  67 -                                       0x0000000L, 0x0009f000L, 1);
  68 +                                       0x0000000L, 0x0009f000L, 0, 0, 1);
  69                          regs.u.r32.ebx = 1;
  70                          regs.u.r32.eax = 0x534D4150;
  71                          regs.u.r32.ecx = 0x14;
  72 @@ -4557,7 +4569,7 @@ ASM_END
  73                          break;
  74                      case 1:
  75                          set_e820_range(ES, regs.u.r16.di,
  76 -                                       0x0009f000L, 0x000a0000L, 2);
  77 +                                       0x0009f000L, 0x000a0000L, 0, 0, 2);
  78                          regs.u.r32.ebx = 2;
  79                          regs.u.r32.eax = 0x534D4150;
  80                          regs.u.r32.ecx = 0x14;
  81 @@ -4566,7 +4578,7 @@ ASM_END
  82                          break;
  83                      case 2:
  84                          set_e820_range(ES, regs.u.r16.di,
  85 -                                       0x000e8000L, 0x00100000L, 2);
  86 +                                       0x000e8000L, 0x00100000L, 0, 0, 2);
  87                          regs.u.r32.ebx = 3;
  88                          regs.u.r32.eax = 0x534D4150;
  89                          regs.u.r32.ecx = 0x14;
  90 @@ -4577,7 +4589,7 @@ ASM_END
  91  #if BX_ROMBIOS32
  92                          set_e820_range(ES, regs.u.r16.di,
  93                                         0x00100000L,
  94 -                                       extended_memory_size - ACPI_DATA_SIZE, 1);
  95 +                                       extended_memory_size - ACPI_DATA_SIZE ,0, 0, 1);
  96                          regs.u.r32.ebx = 4;
  97  #else
  98                          set_e820_range(ES, regs.u.r16.di,
  99 @@ -4593,7 +4605,7 @@ ASM_END
 100                      case 4:
 101                          set_e820_range(ES, regs.u.r16.di,
 102                                         extended_memory_size - ACPI_DATA_SIZE,
 103 -                                       extended_memory_size, 3); // ACPI RAM
 104 +                                       extended_memory_size ,0, 0, 3); // ACPI RAM
 105                          regs.u.r32.ebx = 5;
 106                          regs.u.r32.eax = 0x534D4150;
 107                          regs.u.r32.ecx = 0x14;
 108 @@ -4603,7 +4615,20 @@ ASM_END
 109                      case 5:
 110                          /* 256KB BIOS area at the end of 4 GB */
 111                          set_e820_range(ES, regs.u.r16.di,
 112 -                                       0xfffc0000L, 0x00000000L, 2);
 113 +                                       0xfffc0000L, 0x00000000L ,0, 0, 2);
 114 +                        if (extra_highbits_memory_size || extra_lowbits_memory_size)
 115 +                            regs.u.r32.ebx = 6;
 116 +                        else
 117 +                            regs.u.r32.ebx = 0;
 118 +                        regs.u.r32.eax = 0x534D4150;
 119 +                        regs.u.r32.ecx = 0x14;
 120 +                        CLEAR_CF();
 121 +                        return;
 122 +                    case 6:
 123 +                        /* Maping of memory above 4 GB */
 124 +                        set_e820_range(ES, regs.u.r16.di, 0x00000000L,
 125 +                        extra_lowbits_memory_size, 1, extra_highbits_memory_size
 126 +                                       + 1, 1);
 127                          regs.u.r32.ebx = 0;
 128                          regs.u.r32.eax = 0x534D4150;
 129                          regs.u.r32.ecx = 0x14;