remove realmode and e820 code from kernel
cinap_lenrek
parent
d8c69ebafd
commit
563437cb6d
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@ -642,13 +642,6 @@ hexadecimal 64-bit
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and
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.I end
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addresses of the usable memory areas.
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.SS \fL*norealmode=\fP
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The PC kernel switches the processor to 16-bit real mode
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to run BIOS interrupts, for example to find the memory map or to enable VESA.
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This variable disables such switches.
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.SS \fL*noe820scan=\fP
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When available, the PC kernel uses the BIOS E820 memory map
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to size memory. This variable disables the scan.
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.SS \fL*maxmem=\fIvalue\fP
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This defines the maximum physical address that the system will scan when sizing memory.
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By default the PC operating system will scan up to 3.75 gigabytes
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@ -989,6 +989,39 @@ archctlwrite(Chan*, void *a, long n, vlong)
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return n;
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}
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static long
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rmemrw(int isr, void *a, long n, vlong off)
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{
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if(off < 0 || n < 0)
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error("bad offset/count");
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if(isr){
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if(off >= MB)
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return 0;
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if(off+n >= MB)
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n = MB - off;
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memmove(a, KADDR((ulong)off), n);
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}else{
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/* allow vga framebuf's access */
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if(off >= MB || off+n > MB ||
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(off < 0xA0000 || off+n > 0xB0000+0x10000))
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error("bad offset/count in write");
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memmove(KADDR((ulong)off), a, n);
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}
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return n;
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}
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static long
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rmemread(Chan*, void *a, long n, vlong off)
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{
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return rmemrw(1, a, n, off);
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}
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static long
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rmemwrite(Chan*, void *a, long n, vlong off)
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{
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return rmemrw(0, a, n, off);
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}
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void
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archinit(void)
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{
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@ -1037,6 +1070,7 @@ archinit(void)
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addarchfile("cputype", 0444, cputyperead, nil);
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addarchfile("archctl", 0664, archctlread, archctlwrite);
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addarchfile("realmodemem", 0660, rmemread, rmemwrite);
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}
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/*
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172
sys/src/9/pc/l.s
172
sys/src/9/pc/l.s
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@ -309,178 +309,6 @@ TEXT restoreregs(SB), $0
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POPL AX
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RET
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/*
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* Assumed to be in protected mode at time of call.
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* Switch to real mode, execute an interrupt, and
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* then switch back to protected mode.
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*
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* Assumes:
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*
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* - no device interrupts are going to come in
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* - 0-16MB is identity mapped in page tables
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* - realmode() has copied us down from 0x100000 to 0x8000
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* - can use code segment 0x0800 in real mode
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* to get at l.s code
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* - l.s code is less than 1 page
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*/
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#define RELOC (RMCODE-KTZERO)
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TEXT realmodeidtptr(SB), $0
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WORD $(4*256-1)
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LONG $0
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TEXT realmode0(SB), $0
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CALL saveregs(SB)
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/* switch to low code address */
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LEAL physcode-KZERO(SB), AX
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JMP *AX
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TEXT physcode(SB), $0
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/* switch to low stack */
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MOVL SP, AX
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MOVL $0x7C00, SP
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PUSHL AX
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/* change gdt to physical pointer */
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MOVL m0rgdtptr-KZERO(SB), GDTR
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/* load IDT with real-mode version*/
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MOVL realmodeidtptr-KZERO(SB), IDTR
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/* edit INT $0x00 instruction below */
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MOVL $(RMUADDR-KZERO+48), AX /* &rmu.trap */
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MOVL (AX), AX
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MOVB AX, realmodeintrinst+(-KZERO+1+RELOC)(SB)
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/* disable paging */
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MOVL CR0, AX
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ANDL $0x7FFFFFFF, AX
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MOVL AX, CR0
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/* JMP .+2 to clear prefetch queue*/
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BYTE $0xEB; BYTE $0x00
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/* jump to 16-bit code segment */
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/* JMPFAR SELECTOR(KESEG16, SELGDT, 0):$again16bit(SB) /**/
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BYTE $0xEA
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LONG $again16bit-KZERO(SB)
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WORD $SELECTOR(KESEG16, SELGDT, 0)
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TEXT again16bit(SB), $0
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/*
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* Now in 16-bit compatibility mode.
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* These are 32-bit instructions being interpreted
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* as 16-bit instructions. I'm being lazy and
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* not using the macros because I know when
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* the 16- and 32-bit instructions look the same
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* or close enough.
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*/
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/* disable protected mode and jump to real mode cs */
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OPSIZE; MOVL CR0, AX
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OPSIZE; XORL BX, BX
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OPSIZE; INCL BX
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OPSIZE; XORL BX, AX
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OPSIZE; MOVL AX, CR0
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/* JMPFAR 0x0800:now16real */
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BYTE $0xEA
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WORD $now16real-KZERO(SB)
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WORD $0x0800
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TEXT now16real(SB), $0
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/* copy the registers for the bios call */
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LWI(0x0000, rAX)
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MOVW AX,SS
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LWI(RMUADDR, rBP)
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/* offsets are in Ureg */
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LXW(44, xBP, rAX)
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MOVW AX, DS
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LXW(40, xBP, rAX)
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MOVW AX, ES
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OPSIZE; LXW(0, xBP, rDI)
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OPSIZE; LXW(4, xBP, rSI)
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OPSIZE; LXW(16, xBP, rBX)
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OPSIZE; LXW(20, xBP, rDX)
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OPSIZE; LXW(24, xBP, rCX)
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OPSIZE; LXW(28, xBP, rAX)
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CLC
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TEXT realmodeintrinst(SB), $0
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INT $0x00
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/* save the registers after the call */
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LWI(0x7bfc, rSP)
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OPSIZE; PUSHFL
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OPSIZE; PUSHL AX
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LWI(0, rAX)
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MOVW AX,SS
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LWI(RMUADDR, rBP)
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OPSIZE; SXW(rDI, 0, xBP)
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OPSIZE; SXW(rSI, 4, xBP)
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OPSIZE; SXW(rBX, 16, xBP)
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OPSIZE; SXW(rDX, 20, xBP)
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OPSIZE; SXW(rCX, 24, xBP)
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OPSIZE; POPL AX
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OPSIZE; SXW(rAX, 28, xBP)
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MOVW DS, AX
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OPSIZE; SXW(rAX, 44, xBP)
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MOVW ES, AX
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OPSIZE; SXW(rAX, 40, xBP)
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OPSIZE; POPL AX
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OPSIZE; SXW(rAX, 64, xBP) /* flags */
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/* re-enter protected mode and jump to 32-bit code */
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OPSIZE; MOVL $1, AX
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OPSIZE; MOVL AX, CR0
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/* JMPFAR SELECTOR(KESEG, SELGDT, 0):$again32bit(SB) /**/
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OPSIZE
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BYTE $0xEA
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LONG $again32bit-KZERO(SB)
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WORD $SELECTOR(KESEG, SELGDT, 0)
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TEXT again32bit(SB), $0
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MOVW $SELECTOR(KDSEG, SELGDT, 0),AX
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MOVW AX,DS
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MOVW AX,SS
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MOVW AX,ES
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MOVW AX,FS
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MOVW AX,GS
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/* enable paging and jump to kzero-address code */
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MOVL CR0, AX
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ORL $0x80010000, AX /* PG|WP */
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MOVL AX, CR0
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LEAL again32kzero(SB), AX
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JMP* AX
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TEXT again32kzero(SB), $0
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/* breathe a sigh of relief - back in 32-bit protected mode */
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/* switch to old stack */
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PUSHL AX /* match popl below for 8l */
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MOVL $0x7BFC, SP
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POPL SP
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/* restore idt */
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MOVL m0idtptr(SB),IDTR
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/* restore gdt */
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MOVL m0gdtptr(SB), GDTR
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CALL restoreregs(SB)
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RET
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/*
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* BIOS32.
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*/
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@ -60,8 +60,6 @@
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#define CONFADDR (KZERO+0x1200) /* info passed from boot loader */
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#define TMPADDR (KZERO+0x2000) /* used for temporary mappings */
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#define APBOOTSTRAP (KZERO+0x3000) /* AP bootstrap code */
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#define RMUADDR (KZERO+0x7C00) /* real mode Ureg */
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#define RMCODE (KZERO+0x8000) /* copy of first page of KTEXT */
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#define RMBUF (KZERO+0x9000) /* buffer for user space - known to vga */
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#define IDTADDR (KZERO+0x10800) /* idt */
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#define REBOOTADDR (0x11000) /* reboot code - physical address */
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@ -526,20 +526,10 @@ struct Emap
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{
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uvlong base;
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uvlong len;
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ulong type;
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};
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static Emap emap[16];
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int nemap;
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static char *etypes[] =
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{
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"type=0",
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"memory",
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"reserved",
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"acpi reclaim",
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"acpi nvs",
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};
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static int
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emapcmp(const void *va, const void *vb)
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{
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@ -551,11 +541,7 @@ emapcmp(const void *va, const void *vb)
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return -1;
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if(a->base > b->base)
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return 1;
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if(a->len < b->len)
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return -1;
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if(a->len > b->len)
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return 1;
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return a->type - b->type;
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return a->len - b->len;
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}
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static void
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@ -668,14 +654,15 @@ map(ulong base, ulong len, int type)
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static int
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e820scan(void)
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{
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int i;
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Ureg u;
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ulong cont, base, len;
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ulong base, len;
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uvlong last;
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Emap *e;
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char *s;
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int i;
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if((s = getconf("e820")) != nil){
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/* passed by bootloader */
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if((s = getconf("e820")) == nil)
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return -1;
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for(nemap = 0; nemap < nelem(emap); nemap++){
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if(*s == 0)
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break;
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@ -686,48 +673,10 @@ e820scan(void)
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e->len = strtoull(s, &s, 16) - e->base;
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if(*s != ' ' && *s != 0 || e->len >= 1ull<<32 || e->len == 0)
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break;
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e->type = Ememory;
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}
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}else{
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if(getconf("*norealmode") || getconf("*noe820scan"))
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return -1;
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cont = 0;
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for(i=0; i<nelem(emap); i++){
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memset(&u, 0, sizeof u);
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u.ax = 0xE820;
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u.bx = cont;
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u.cx = 20;
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u.dx = SMAP;
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u.es = (PADDR(RMBUF)>>4)&0xF000;
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u.di = PADDR(RMBUF)&0xFFFF;
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u.trap = 0x15;
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realmode(&u);
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cont = u.bx;
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if((u.flags&Carry) || u.ax != SMAP || u.cx != 20)
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break;
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e = &emap[nemap++];
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*e = *(Emap*)RMBUF;
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if(u.bx == 0)
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break;
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}
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}
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if(nemap == 0)
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return -1;
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qsort(emap, nemap, sizeof emap[0], emapcmp);
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if(s == nil && getconf("*noe820print") == nil){
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for(i=0; i<nemap; i++){
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e = &emap[i];
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print("E820: %.8llux %.8llux ", e->base, e->base+e->len);
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if(e->type < nelem(etypes))
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print("%s\n", etypes[e->type]);
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else
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print("type=%lud\n", e->type);
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}
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}
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last = 0;
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for(i=0; i<nemap; i++){
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e = &emap[i];
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@ -747,10 +696,7 @@ e820scan(void)
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if(last < e->base)
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map(last, e->base-last, MemUPA);
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last = base+len;
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if(e->type == Ememory)
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map(base, len, MemRAM);
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else
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map(base, len, MemReserved);
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}
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if(last < (1LL<<32))
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map(last, (u32int)-last, MemUPA);
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@ -38,7 +38,6 @@ dev
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link
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segdesc
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realmode
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devpccard
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devi82365
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apm apmjump
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@ -39,7 +39,6 @@ dev
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link
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segdesc
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realmode
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devpccard
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devi82365
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apm apmjump
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@ -1,140 +0,0 @@
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#include "u.h"
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#include "tos.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "io.h"
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#include "ureg.h"
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#include "../port/error.h"
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/*
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* Back the processor into real mode to run a BIOS call,
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* then return. This must be used carefully, since it
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* completely disables hardware interrupts (e.g., the i8259)
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* while running. It is *not* using VM86 mode.
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* Maybe that's really the right answer, but real mode
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* is fine for now. We don't expect to use this very much --
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* just for VGA and APM.
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*/
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#define realmoderegs (*(Ureg*)RMUADDR)
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#define LORMBUF (RMBUF-KZERO)
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static Ureg rmu;
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static Lock rmlock;
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void
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realmode(Ureg *ureg)
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{
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int s;
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ulong cr3;
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extern void realmode0(void); /* in l.s */
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if(getconf("*norealmode"))
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return;
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lock(&rmlock);
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realmoderegs = *ureg;
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/* copy l.s so that it can be run from 16-bit mode */
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memmove((void*)RMCODE, (void*)KTZERO, 0x1000);
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s = splhi();
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m->pdb[PDX(0)] = m->pdb[PDX(KZERO)]; /* identity map low */
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cr3 = getcr3();
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putcr3(PADDR(m->pdb));
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if (arch)
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arch->introff();
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else
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i8259off();
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realmode0();
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if(m->tss){
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/*
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* Called from memory.c before initialization of mmu.
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* Don't turn interrupts on before the kernel is ready!
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*/
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if (arch)
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arch->intron();
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else
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i8259on();
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}
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m->pdb[PDX(0)] = 0; /* remove low mapping */
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putcr3(cr3);
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splx(s);
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*ureg = realmoderegs;
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unlock(&rmlock);
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}
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static long
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rtrapread(Chan*, void *a, long n, vlong off)
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{
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if(off < 0)
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error("badarg");
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if(n+off > sizeof rmu)
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n = sizeof rmu - off;
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if(n <= 0)
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return 0;
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memmove(a, (char*)&rmu+off, n);
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return n;
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}
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static long
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rtrapwrite(Chan*, void *a, long n, vlong off)
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{
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if(off || n != sizeof rmu)
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error("write a Ureg");
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memmove(&rmu, a, sizeof rmu);
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/*
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* Sanity check
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*/
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if(rmu.trap == 0x10){ /* VBE */
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rmu.es = (LORMBUF>>4)&0xF000;
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rmu.di = LORMBUF&0xFFFF;
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}else
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error("invalid trap arguments");
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realmode(&rmu);
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return n;
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}
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static long
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rmemrw(int isr, void *a, long n, vlong off)
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{
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if(off < 0 || n < 0)
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error("bad offset/count");
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if(isr){
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if(off >= MB)
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return 0;
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if(off+n >= MB)
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n = MB - off;
|
||||
memmove(a, KADDR((ulong)off), n);
|
||||
}else{
|
||||
/* realmode buf page ok, allow vga framebuf's access */
|
||||
if(off >= MB || off+n > MB ||
|
||||
(off < LORMBUF || off+n > LORMBUF+BY2PG) &&
|
||||
(off < 0xA0000 || off+n > 0xB0000+0x10000))
|
||||
error("bad offset/count in write");
|
||||
memmove(KADDR((ulong)off), a, n);
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
static long
|
||||
rmemread(Chan*, void *a, long n, vlong off)
|
||||
{
|
||||
return rmemrw(1, a, n, off);
|
||||
}
|
||||
|
||||
static long
|
||||
rmemwrite(Chan*, void *a, long n, vlong off)
|
||||
{
|
||||
return rmemrw(0, a, n, off);
|
||||
}
|
||||
|
||||
void
|
||||
realmodelink(void)
|
||||
{
|
||||
addarchfile("realmode", 0660, rtrapread, rtrapwrite);
|
||||
addarchfile("realmodemem", 0660, rmemread, rmemwrite);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue