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- Protect multiboot info from being overwritten
- Pass command line to MachInit() funcs svn path=/trunk/; revision=14725
This commit is contained in:
Gé van Geldorp
parent
ee219b0e23
commit
5568b1261a
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@ -275,9 +275,11 @@ EXTERN(_DisableA20)
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* other boot loaders like Grub
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*/
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#define MB_INFO_SIZE 90
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#define MB_INFO_FLAGS_OFFSET 0
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#define MB_INFO_BOOT_DEVICE_OFFSET 12
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#define MB_INFO_COMMAND_LINE_OFFSET 16
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#define CMDLINE_SIZE 256
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/*
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* We want to execute at 0x8000 (to be compatible with bootsector
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@ -285,7 +287,6 @@ EXTERN(_DisableA20)
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* above 1MB. So we let Grub load us there and then relocate
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* ourself to 0x8000
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*/
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#define CMDLINE_BASE 0x7000
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#define FREELDR_BASE 0x8000
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#define INITIAL_BASE 0x200000
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@ -328,6 +329,31 @@ mb1:
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movw %dx,%ds
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movw %dx,%es
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/* Check for valid multiboot signature */
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cmpl $MULTIBOOT_BOOTLOADER_MAGIC,%eax
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jne mbfail
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/* Store multiboot info in a safe place */
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movl %ebx,%esi
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movl $(mb_info + INITIAL_BASE - FREELDR_BASE),%edi
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movl $MB_INFO_SIZE,%ecx
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rep movsb
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/* Save commandline */
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movl MB_INFO_FLAGS_OFFSET(%ebx),%edx
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testl $MB_INFO_FLAG_COMMAND_LINE,MB_INFO_FLAGS_OFFSET(%ebx)
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jz mb3
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movl MB_INFO_COMMAND_LINE_OFFSET(%ebx),%esi
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movl $(cmdline + INITIAL_BASE - FREELDR_BASE),%edi
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movl $CMDLINE_SIZE,%ecx
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mb2: lodsb
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stosb
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testb %al,%al
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jz mb3
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dec %ecx
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jnz mb2
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mb3:
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/* Copy to low mem */
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movl $INITIAL_BASE,%esi
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movl $FREELDR_BASE,%edi
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@ -342,8 +368,8 @@ mb1:
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/* Clear prefetch queue & correct CS,
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* jump to low mem */
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ljmp $PMODE_CS, $mb2
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mb2:
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ljmp $PMODE_CS, $mb4
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mb4:
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/* Reload segment selectors */
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movw $PMODE_DS,%dx
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movw %dx,%ds
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@ -353,39 +379,28 @@ mb2:
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movw %dx,%ss
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movl $STACK32ADDR,%esp
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/* Check for valid multiboot signature */
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cmpl $MULTIBOOT_BOOTLOADER_MAGIC,%eax
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jne mbfail
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movl $mb_info,%ebx
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/* See if the boot device was passed in */
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movl MB_INFO_FLAGS_OFFSET(%ebx),%edx
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testl $MB_INFO_FLAG_BOOT_DEVICE,%edx
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jz mb3
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jz mb5
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/* Retrieve boot device info */
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movl MB_INFO_BOOT_DEVICE_OFFSET(%ebx),%eax
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shrl $16,%eax
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incb %al
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movb %al,_i386BootPartition
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movb %ah,_i386BootDrive
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jmp mb4
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mb3: /* No boot device known, assume first partition of first harddisk */
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jmp mb6
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mb5: /* No boot device known, assume first partition of first harddisk */
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movb $0x80,_i386BootDrive
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movb $1,_i386BootPartition
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mb4:
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/* Check for a command line */
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xorl %eax,%eax
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testl $MB_INFO_FLAG_COMMAND_LINE,%edx
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jz mb6
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/* Copy command line to low mem*/
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movl MB_INFO_COMMAND_LINE_OFFSET(%ebx),%esi
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movl $CMDLINE_BASE,%edi
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mb5: lodsb
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stosb
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testb %al,%al
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jnz mb5
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movl $CMDLINE_BASE,%eax
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mb6:
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/* Check for command line */
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mov $cmdline,%eax
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testl $MB_INFO_FLAG_COMMAND_LINE,MB_INFO_FLAGS_OFFSET(%ebx)
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jnz mb7
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xorl %eax,%eax
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mb7:
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/* GO! */
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pushl %eax
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@ -467,3 +482,10 @@ EXTERN(_i386BootDrive)
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EXTERN(_i386BootPartition)
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.long 0
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.bss
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mb_info:
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.fill MB_INFO_SIZE, 1, 0
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cmdline:
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.fill CMDLINE_SIZE, 1, 0
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@ -27,7 +27,7 @@
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#include "rtl.h"
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VOID
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MachInit(VOID)
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MachInit(char *CmdLine)
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{
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ULONG PciId;
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@ -39,11 +39,11 @@ MachInit(VOID)
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PciId = READ_PORT_ULONG((ULONG*) 0xcfc);
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if (0x02a510de == PciId)
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{
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XboxMachInit();
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XboxMachInit(CmdLine);
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}
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else
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{
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PcMachInit();
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PcMachInit(CmdLine);
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}
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HalpCalibrateStallExecution();
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@ -26,7 +26,7 @@
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#include "i386.h"
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VOID
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PcMachInit(VOID)
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PcMachInit(char *CmdLine)
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{
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EnableA20();
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@ -26,7 +26,7 @@
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#include "mm.h"
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#endif
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VOID PcMachInit(VOID);
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VOID PcMachInit(char *CmdLine);
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VOID PcConsPutChar(int Ch);
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BOOL PcConsKbHit();
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@ -24,7 +24,7 @@
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#include "i386.h"
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VOID
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XboxMachInit(VOID)
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XboxMachInit(char *CmdLine)
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{
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/* Initialize our stuff */
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XboxMemInit();
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@ -26,7 +26,7 @@
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UCHAR XboxFont8x16[256 * 16];
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VOID XboxMachInit(VOID);
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VOID XboxMachInit(char *CmdLine);
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VOID XboxConsPutChar(int Ch);
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BOOL XboxConsKbHit();
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@ -279,7 +279,7 @@ void PpcInit( of_proxy the_ofproxy ) {
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BootMain("freeldr-ppc");
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}
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void MachInit() {
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void MachInit(char *CmdLine) {
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int len;
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printf( "Determining boot device:\n" );
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len = ofw_getprop(chosen_package, "bootpath",
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@ -31,7 +31,7 @@ VOID BootMain(char *CmdLine)
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{
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CmdLineParse(CmdLine);
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MachInit();
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MachInit(CmdLine);
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DebugInit();
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@ -71,7 +71,7 @@ typedef struct tagMACHVTBL
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VOID (*HwDetect)(VOID);
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} MACHVTBL, *PMACHVTBL;
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VOID MachInit(VOID);
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VOID MachInit(char *CmdLine);
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extern MACHVTBL MachVtbl;
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