diff options
Diffstat (limited to 'src/VBox/Devices/PC/BIOS/system.c')
| -rw-r--r-- | src/VBox/Devices/PC/BIOS/system.c | 86 |
1 files changed, 52 insertions, 34 deletions
diff --git a/src/VBox/Devices/PC/BIOS/system.c b/src/VBox/Devices/PC/BIOS/system.c index bcc9f3d6..449683a5 100644 --- a/src/VBox/Devices/PC/BIOS/system.c +++ b/src/VBox/Devices/PC/BIOS/system.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2006-2011 Oracle Corporation + * Copyright (C) 2006-2013 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; @@ -191,7 +191,7 @@ void pm_unwind(uint16_t args); "push cx" \ "retf" \ parm [ax] modify nomemory aborts; - + // @todo: This method is silly. The RTC should be programmed to fire an interrupt // instead of hogging the CPU with inaccurate code. void timer_wait(uint16_t lo, uint16_t hi); @@ -223,18 +223,18 @@ void timer_wait(uint16_t lo, uint16_t hi); bx_bool set_enable_a20(bx_bool val) { uint8_t oldval; - + // Use PS/2 System Control port A to set A20 enable - + // get current setting first oldval = inb(0x92); - + // change A20 status if (val) outb(0x92, oldval | 0x02); else outb(0x92, oldval & 0xfd); - + return((oldval & 0x02) != 0); } @@ -275,6 +275,8 @@ void set_e820_range(uint16_t ES, uint16_t DI, uint32_t start, uint32_t end, #define EBX r.gr.u.r32.ebx #define ECX r.gr.u.r32.ecx #define EDX r.gr.u.r32.edx +#define ESI r.gr.u.r32.esi +#define EDI r.gr.u.r32.edi #define ES r.es @@ -385,7 +387,7 @@ void BIOSCALL int15_function(sys_regs_t r) SET_AH(UNSUPPORTED_FUNCTION); SET_AL(GET_AL() - 1); } - + break; } @@ -396,15 +398,15 @@ void BIOSCALL int15_function(sys_regs_t r) #endif // +++ should probably have descriptor checks // +++ should have exception handlers - + // turn off interrupts int_disable(); //@todo: aren't they disabled already? - + prev_a20_enable = set_enable_a20(1); // enable A20 line - + // 128K max of transfer on 386+ ??? // source == destination ??? - + // ES:SI points to descriptor table // offset use initially comments // ============================================== @@ -414,14 +416,14 @@ void BIOSCALL int15_function(sys_regs_t r) // 18..1f dest dddddddd destination of data // 20..27 CS zeros filled in by BIOS // 28..2f SS zeros filled in by BIOS - + //es:si //eeee0 //0ssss //----- - + // check for access rights of source & dest here - + // Initialize GDT descriptor base15_00 = (ES << 4) + SI; base23_16 = ES >> 12; @@ -432,14 +434,14 @@ void BIOSCALL int15_function(sys_regs_t r) write_byte(ES, SI+0x08+4, base23_16);// base 23:16 write_byte(ES, SI+0x08+5, 0x93); // access write_word(ES, SI+0x08+6, 0x0000); // base 31:24/reserved/limit 19:16 - + // Initialize CS descriptor write_word(ES, SI+0x20+0, 0xffff);// limit 15:00 = normal 64K limit write_word(ES, SI+0x20+2, 0x0000);// base 15:00 write_byte(ES, SI+0x20+4, 0x000f);// base 23:16 write_byte(ES, SI+0x20+5, 0x9b); // access write_word(ES, SI+0x20+6, 0x0000);// base 31:24/reserved/limit 19:16 - + // Initialize SS descriptor ss = read_ss(); base15_00 = ss << 4; @@ -449,18 +451,18 @@ void BIOSCALL int15_function(sys_regs_t r) write_byte(ES, SI+0x28+4, base23_16);// base 23:16 write_byte(ES, SI+0x28+5, 0x93); // access write_word(ES, SI+0x28+6, 0x0000); // base 31:24/reserved/limit 19:16 - + pm_stack_save(CX, ES, SI); pm_enter(); pm_copy(); pm_exit(); pm_stack_restore(); - + set_enable_a20(prev_a20_enable); - + // turn interrupts back on int_enable(); - + SET_AH(0); CLEAR_CF(); break; @@ -472,12 +474,12 @@ void BIOSCALL int15_function(sys_regs_t r) SET_CF(); #else AX = (inb_cmos(0x31) << 8) | inb_cmos(0x30); - + // According to Ralf Brown's interrupt the limit should be 15M, // but real machines mostly return max. 63M. if(AX > 0xffc0) AX = 0xffc0; - + CLEAR_CF(); #endif break; @@ -487,12 +489,12 @@ void BIOSCALL int15_function(sys_regs_t r) // ES:DI points to user-supplied GDT // BH/BL contains starting interrupt numbers for PIC0/PIC1 // This subfunction does not return! - + // turn off interrupts int_disable(); //@todo: aren't they off already? - + set_enable_a20(1); // enable A20 line; we're supposed to fail if that fails - + // Initialize CS descriptor for BIOS write_word(ES, SI+0x38+0, 0xffff);// limit 15:00 = normal 64K limit write_word(ES, SI+0x38+2, 0x0000);// base 15:00 @@ -591,7 +593,21 @@ void BIOSCALL int15_function32(sys32_regs_t r) int_enable(); timer_wait(DX, CX); break; - + + case 0xd0: + if (GET_AL() != 0x4f) + goto int15_unimplemented; + if (EBX == 0x50524f43 && ECX == 0x4d4f4445 && ESI == 0 && EDI == 0) + { + CLEAR_CF(); + ESI = EBX; + EDI = ECX; + EAX = 0x49413332; + } + else + goto int15_unimplemented; + break; + case 0xe8: switch(GET_AL()) { case 0x20: // coded by osmaker aka K.J. @@ -728,13 +744,15 @@ void BIOSCALL int15_function32(sys32_regs_t r) case 7: #ifdef VBOX /* Don't succeeded if no memory above 4 GB. */ /* Mapping of memory above 4 GB if present. - Note: set_e820_range needs do no borrowing in the - subtraction because of the nice numbers. */ + Note1: set_e820_range needs do no borrowing in the + subtraction because of the nice numbers. + Note2* works only up to 1TB because of uint8_t for + the upper bits!*/ if (extra_highbits_memory_size || extra_lowbits_memory_size) { set_e820_range(ES, DI, 0x00000000L, extra_lowbits_memory_size, - 1 /*GB*/, extra_highbits_memory_size + 1 /*GB*/, 1); + 1 /*x4GB*/, extra_highbits_memory_size + 1 /*x4GB*/, 1); EBX = 0; } break; @@ -763,24 +781,24 @@ void BIOSCALL int15_function32(sys32_regs_t r) case 0x01: // do we have any reason to fail here ? CLEAR_CF(); - + // my real system sets ax and bx to 0 // this is confirmed by Ralph Brown list // but syslinux v1.48 is known to behave // strangely if ax is set to 0 // regs.u.r16.ax = 0; // regs.u.r16.bx = 0; - + // Get the amount of extended memory (above 1M) CX = (inb_cmos(0x31) << 8) | inb_cmos(0x30); - + // limit to 15M if(CX > 0x3c00) CX = 0x3c00; - + // Get the amount of extended memory above 16M in 64k blocks DX = (inb_cmos(0x35) << 8) | inb_cmos(0x34); - + // Set configured memory equal to extended memory AX = CX; BX = DX; |