9boot: pxe/kernel memory overlap problem, add unload function
This commit is contained in:
cinap_lenrek
parent
1bab61a082
commit
e2876cdfc7
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@ -4,16 +4,14 @@
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TEXT a20(SB), $0
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CALL rmode16(SB)
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STI
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CALL16(spllo(SB))
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LWI(0x2401, rAX)
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BIOSCALL(0x15)
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JC _biosfail
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CLI
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CALL16(pmode32(SB))
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RET
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_biosfail:
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CLI
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CALL16(pmode32(SB))
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CALL a20wait(SB)
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@ -63,6 +63,11 @@ struct Pbs
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int readsect(ulong drive, ulong lba, void *buf);
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void
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unload(void)
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{
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}
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int
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read(void *f, void *data, int len)
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{
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@ -16,6 +16,7 @@ void jump(void *pc);
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int read(void *f, void *data, int len);
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int readn(void *f, void *data, int len);
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void close(void *f);
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void unload(void);
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void memset(void *p, int v, int n);
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void memmove(void *dst, void *src, int n);
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@ -39,6 +39,11 @@ struct Dir
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int readsect(ulong drive, ulong lba, void *buf);
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void
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unload(void)
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{
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}
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int
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read(void *f, void *data, int len)
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{
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@ -79,9 +79,6 @@ TEXT rmode16(SB), $0
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JMP _segret
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TEXT rmode16x(SB), $0
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/* reload idt */
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SEGSS; LIDT(tidtptr(SB))
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/* disable protected mode */
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MFCR(rCR0, rCX)
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ANDB $0xfe, CL
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@ -124,10 +121,6 @@ TEXT tgdtptr(SB), $0
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WORD $(5*8)
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LONG $tgdt(SB)
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TEXT tidtptr(SB), $0
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WORD $0x3ff
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LONG $0
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TEXT jump(SB), $0
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MOVL 4(SP), AX
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JMP *AX
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@ -180,6 +173,33 @@ _pret32:
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#ifdef PXE
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TEXT pxeinit(SB), $0
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CALL rmode16(SB)
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/* get pxe env structure in ES:BX */
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LWI(0x5650, rAX)
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BIOSCALL(0x1A)
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JC _pret32
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/* !PXE or PXEENV+ signature */
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SEGES; LXW(0, xBX, rAX)
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CMPI((('!'<<0)|('P'<<8)), rAX)
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JEQ _getentry
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CMPI((('P'<<0)|('X'<<8)), rAX)
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JNE _pret32
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SEGES; LXW(0x2A, xBX, rAX)
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SEGES; LXW(0x28, xBX, rBX)
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MTSR(rAX, rES)
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_getentry:
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SEGES; LXW(0x12, xBX, rAX)
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SW(rAX, pxepseg(SB))
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SEGES; LXW(0x10, xBX, rAX)
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SW(rAX, pxepoff(SB))
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CLR(rAX)
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JMP _pret32
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TEXT pxecallret(SB), $0
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ADDI(6, rSP)
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JMP _pret32
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@ -200,26 +220,9 @@ TEXT pxecall(SB), $0
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PUSHR(rCX)
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PUSHI(pxecallret(SB))
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/* get pxe env structure in ES:BX */
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LWI(0x5650, rAX)
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BIOSCALL(0x1A)
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JC _farret
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/* !PXE or PXEENV+ signature */
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SEGES; LXW(0, xBX, rAX)
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CMPI((('!'<<0)|('P'<<8)), rAX)
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JEQ _getentry
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CMPI((('P'<<0)|('X'<<8)), rAX)
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JNE _farret
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SEGES; LXW(0x2A, xBX, rAX)
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SEGES; LXW(0x28, xBX, rBX)
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MTSR(rAX, rES)
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_getentry:
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SEGES; LXW(0x12, xBX, rAX)
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LW(pxepseg(SB), rAX)
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PUSHR(rAX)
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SEGES; LXW(0x10, xBX, rAX)
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LW(pxepoff(SB), rAX)
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PUSHR(rAX)
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CALL16(spllo(SB))
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@ -230,9 +233,13 @@ _getentry:
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CLR(rDX)
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CLR(rDI)
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CLR(rSI)
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_farret:
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FARRET
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TEXT pxepseg(SB), $0
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WORD $0
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TEXT pxepoff(SB), $0
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WORD $0
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#else /* PXE */
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/*
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@ -13,62 +13,17 @@
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#define PGSHIFT 12 /* log(BY2PG) */
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#define PGROUND(s) (((s)+(BY2PG-1))&~(BY2PG-1))
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#define MAXMACH 1 /* max # cpus system can run */
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/*
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* Time
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*/
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#define HZ (100) /* clock frequency */
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#define MS2HZ (1000/HZ) /* millisec per clock tick */
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#define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
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#define TK2MS(x) ((x)*(1000/HZ))
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#define MS2TK(t) ((((ulong)(t))*HZ)/1000) /* milliseconds to ticks */
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/*
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* Fundamental addresses
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*/
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#define IDTADDR 0x80000800 /* idt */
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#define APBOOTSTRAP 0x80001000 /* AP bootstrap code */
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#define CONFADDR 0x80001200 /* info passed from boot loader */
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#define CPU0PDB 0x80002000 /* bootstrap processor PDB */
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#define CPU0PTE 0x80003000 /* bootstrap processor PTE's for 0-4MB */
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#define MACHADDR 0x80004000 /* as seen by current processor */
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#define CPU0MACH 0x80005000 /* Mach for bootstrap processor */
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#define BIOSXCHG 0x80006000 /* To exchange data with the BIOS */
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#define MACHSIZE (BY2PG*8) /* stack size */
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/*
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* Address spaces
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*
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* Kernel is at 2GB-4GB
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*/
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#define KZERO 0x80000000 /* base of kernel address space */
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#define KTZERO KZERO /* first address in kernel text */
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#define ROMBIOS (KZERO|0xF0000)
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/*
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* known 80386 segments (in GDT) and their selectors
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*/
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#define NULLSEG 0 /* null segment */
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#define KDSEG 1 /* kernel data/stack */
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#define KESEG 2 /* kernel executable */
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#define UDSEG 3 /* user data/stack */
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#define UESEG 4 /* user executable */
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#define SYSGATE 5 /* system call gate */
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#define TSSSEG 6 /* task segment */
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#define SELGDT (0<<3) /* selector is in gdt */
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#define SELLDT (1<<3) /* selector is in ldt */
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#define SELECTOR(i, t, p) (((i)<<3) | (t) | (p))
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#define NULLSEL SELECTOR(NULLSEG, SELGDT, 0)
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#define KESEL SELECTOR(KESEG, SELGDT, 0)
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#define KDSEL SELECTOR(KDSEG, SELGDT, 0)
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#define UESEL SELECTOR(UESEG, SELGDT, 3)
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#define UDSEL SELECTOR(UDSEG, SELGDT, 3)
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#define TSSSEL SELECTOR(TSSSEG, SELGDT, 0)
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/*
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* fields in segment descriptors
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*/
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@ -89,26 +44,3 @@
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#define SEGR (1<<9) /* readable (for code) */
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#define SEGD (1<<22) /* default 1==32bit (for code) */
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/*
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* virtual MMU
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*/
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#define PTEMAPMEM (1024*1024) /* ??? */
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#define SEGMAPSIZE 16 /* ??? */
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#define PTEPERTAB (PTEMAPMEM/BY2PG) /* ??? */
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#define PPN(x) ((x)&~(BY2PG-1))
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/*
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* physical MMU
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*/
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#define PTEVALID (1<<0)
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#define PTEUNCACHED 0 /* everything is uncached */
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#define PTEWRITE (1<<1)
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#define PTERONLY (0<<1)
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#define PTEKERNEL (0<<2)
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#define PTEUSER (1<<2)
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#define PTESIZE (1<<7)
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/*
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* flag register bits that we care about
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*/
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#define IFLAG 0x200
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@ -57,6 +57,7 @@ struct Dhcp
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char bootfile[128];
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};
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int pxeinit(void);
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int pxecall(int op, void *buf);
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static void*
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@ -105,6 +106,17 @@ moveip(IP4 d, IP4 s)
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memmove(d, s, sizeof(d));
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}
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void
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unload(void)
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{
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struct {
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uchar status[2];
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uchar junk[10];
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} buf;
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puts(buf.status, 0);
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pxecall(0x70, &buf);
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}
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static int
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getip(IP4 yip, IP4 sip, IP4 gip, char mac[16])
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{
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@ -153,7 +165,7 @@ udpopen(IP4 sip)
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static int
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udpclose(void)
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{
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char status[2];
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uchar status[2];
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puts(status, 0);
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return pxecall(0x31, status);
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}
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@ -268,6 +280,7 @@ close(void *f)
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udpclose();
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}
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static int
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tftpopen(Tftp *t, char *path, IP4 sip, IP4 dip, IP4 gip)
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{
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@ -311,6 +324,10 @@ start(void *)
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void *f;
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Tftp t;
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if(pxeinit()){
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print("pxe init\r\n");
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halt();
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}
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if(getip(yip, sip, gip, mac)){
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print("bad dhcp\r\n");
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halt();
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@ -18,9 +18,18 @@ memmove(void *dst, void *src, int n)
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{
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uchar *d = dst;
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uchar *s = src;
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while(n > 0){
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*d++ = *s++;
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n--;
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if(d < s){
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while(n > 0){
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*d++ = *s++;
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n--;
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}
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} if(d > s){
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s += n;
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d += n;
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while(n > 0){
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*--d = *--s;
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n--;
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}
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}
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}
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@ -192,9 +201,9 @@ beswal(ulong l)
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char*
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bootkern(void *f)
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{
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uchar *e, *d;
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uchar *e, *d, *t;
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ulong n;
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Exec ex;
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int n;
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a20();
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if(readn(f, &ex, sizeof(ex)) != sizeof(ex))
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@ -202,14 +211,25 @@ bootkern(void *f)
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if(beswal(ex.magic) != I_MAGIC)
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return "bad magic";
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e = (uchar*)(beswal(ex.entry) & ~0xF0000000UL);
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/*
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* the kernels load addess (entry) might overlap
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* with some bios memory (pxe) that is needed to load
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* it. so we read it to this address and after
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* we finished, move it to final location.
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*/
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t = (uchar*)0x200000;
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n = beswal(ex.text);
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if(readn(f, e, n) != n)
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if(readn(f, t, n) != n)
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goto Error;
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d = (uchar*)(((ulong)e + n + 0xFFF) & ~0xFFFUL);
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d = t + ((uchar*)PGROUND((ulong)e + n) - e);
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n = beswal(ex.data);
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if(readn(f, d, n) != n)
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goto Error;
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close(f);
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unload();
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n = (d + n) - t;
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memmove(e, t, n);
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jump(e);
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Error:
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return "i/o error";
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