diff options
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/i386/i386/machdep.c | 17 | ||||
| -rw-r--r-- | sys/arch/i386/i386/pmap.c | 16 | ||||
| -rw-r--r-- | sys/arch/i386/i386/pmap.old.c | 16 | ||||
| -rw-r--r-- | sys/arch/i386/isa/isa_machdep.c | 176 | ||||
| -rw-r--r-- | sys/arch/i386/isa/isa_machdep.h | 8 |
5 files changed, 105 insertions, 128 deletions
diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c index 97341394fc8..35f185a1e09 100644 --- a/sys/arch/i386/i386/machdep.c +++ b/sys/arch/i386/i386/machdep.c @@ -1,4 +1,4 @@ -/* $OpenBSD: machdep.c,v 1.51 1997/09/22 21:03:53 niklas Exp $ */ +/* $OpenBSD: machdep.c,v 1.52 1997/09/24 22:28:15 niklas Exp $ */ /* $NetBSD: machdep.c,v 1.202 1996/05/18 15:54:59 christos Exp $ */ /*- @@ -119,7 +119,6 @@ #endif #include "isa.h" -#include "isadma.h" #include "npx.h" #if NNPX > 0 extern struct proc *npxproc; @@ -203,7 +202,7 @@ cpu_startup() struct pcb *pcb; int x; - /* + /* * Initialize error message buffer (at end of core). */ /* avail_end was pre-decremented in pmap_bootstrap to compensate */ @@ -221,14 +220,6 @@ cpu_startup() 1024 * cnvmem, 1024 * extmem); printf("real mem = %d\n", ctob(physmem)); -#if NISA > 0 && NISADMA > 0 - /* - * We need the bounce buffer allocated early so we have a good chance - * of getting a chunk of continuous low memory. - */ - isadma_init(); -#endif - /* * Find out how much space we need, allocate it, * and then give everything true virtual addresses. @@ -293,8 +284,8 @@ cpu_startup() * Finally, allocate mbuf pool. Since mclrefcnt is an off-size * we use the more space efficient malloc in place of kmem_alloc. */ - mclrefcnt = (char *)malloc(NMBCLUSTERS+CLBYTES/MCLBYTES, M_MBUF, - M_NOWAIT); + mclrefcnt = (char *)malloc(NMBCLUSTERS+CLBYTES/MCLBYTES, + M_MBUF, M_NOWAIT); bzero(mclrefcnt, NMBCLUSTERS+CLBYTES/MCLBYTES); mb_map = kmem_suballoc(kernel_map, (vm_offset_t *)&mbutl, &maxaddr, VM_MBUF_SIZE, FALSE); diff --git a/sys/arch/i386/i386/pmap.c b/sys/arch/i386/i386/pmap.c index 5153e7871ea..ed3eb9f7ba1 100644 --- a/sys/arch/i386/i386/pmap.c +++ b/sys/arch/i386/i386/pmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.c,v 1.19 1997/09/22 21:03:54 niklas Exp $ */ +/* $OpenBSD: pmap.c,v 1.20 1997/09/24 22:28:15 niklas Exp $ */ /* $NetBSD: pmap.c,v 1.36 1996/05/03 19:42:22 christos Exp $ */ /* @@ -284,6 +284,20 @@ pmap_bootstrap(virtual_start) */ virtual_avail = reserve_dumppages(virtual_avail); + /* + * reserve special hunk of memory for use by bus dma as a bounce + * buffer (contiguous virtual *and* physical memory). XXX + */ +#if NISA > 0 && NISADMA > 0 + if (ctob(physmem) >= 0x1000000) { + isaphysmem = pmap_steal_memory(DMA_BOUNCE * NBPG); + isaphysmempgs = DMA_BOUNCE; + } else { + isaphysmem = pmap_steal_memory(DMA_BOUNCE_LOW * NBPG); + isaphysmempgs = DMA_BOUNCE_LOW; + } +#endif + /* flawed, no mappings?? */ if (ctob(physmem) > 31*1024*1024 && MAXKPDE != NKPDE) { vm_offset_t p; diff --git a/sys/arch/i386/i386/pmap.old.c b/sys/arch/i386/i386/pmap.old.c index 814dcfebd8d..3aa6887d912 100644 --- a/sys/arch/i386/i386/pmap.old.c +++ b/sys/arch/i386/i386/pmap.old.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.old.c,v 1.19 1997/09/22 21:03:54 niklas Exp $ */ +/* $OpenBSD: pmap.old.c,v 1.20 1997/09/24 22:28:15 niklas Exp $ */ /* $NetBSD: pmap.c,v 1.36 1996/05/03 19:42:22 christos Exp $ */ /* @@ -284,6 +284,20 @@ pmap_bootstrap(virtual_start) */ virtual_avail = reserve_dumppages(virtual_avail); + /* + * reserve special hunk of memory for use by bus dma as a bounce + * buffer (contiguous virtual *and* physical memory). XXX + */ +#if NISA > 0 && NISADMA > 0 + if (ctob(physmem) >= 0x1000000) { + isaphysmem = pmap_steal_memory(DMA_BOUNCE * NBPG); + isaphysmempgs = DMA_BOUNCE; + } else { + isaphysmem = pmap_steal_memory(DMA_BOUNCE_LOW * NBPG); + isaphysmempgs = DMA_BOUNCE_LOW; + } +#endif + /* flawed, no mappings?? */ if (ctob(physmem) > 31*1024*1024 && MAXKPDE != NKPDE) { vm_offset_t p; diff --git a/sys/arch/i386/isa/isa_machdep.c b/sys/arch/i386/isa/isa_machdep.c index 208b11317d3..73cb52256b7 100644 --- a/sys/arch/i386/isa/isa_machdep.c +++ b/sys/arch/i386/isa/isa_machdep.c @@ -1,4 +1,4 @@ -/* $OpenBSD: isa_machdep.c,v 1.21 1997/09/22 21:03:55 niklas Exp $ */ +/* $OpenBSD: isa_machdep.c,v 1.22 1997/09/24 22:28:16 niklas Exp $ */ /* $NetBSD: isa_machdep.c,v 1.14 1996/05/12 23:06:18 mycroft Exp $ */ /*- @@ -63,13 +63,15 @@ typedef (*vector) __P((void)); extern vector IDTVEC(intr)[], IDTVEC(fast)[]; extern struct gate_descriptor idt[]; - -extern vm_map_t kernel_map; - void isa_strayintr __P((int)); void intr_calculatemasks __P((void)); int fakeintr __P((void *)); +vm_offset_t bounce_alloc __P((vm_size_t, vm_offset_t, int)); +caddr_t bounce_vaddr __P((vm_offset_t)); +void bounce_free __P((vm_offset_t, vm_size_t)); +void isadma_copyfrombuf __P((caddr_t, vm_size_t, int, struct isadma_seg *)); + /* * Fill in default interrupt table (in case of spuruious interrupt * during configuration of kernel, setup interrupt control unit @@ -357,90 +359,43 @@ static int bit_ptr = -1; /* last segment visited */ static int chunk_size = 0; /* size (bytes) of one low mem segment */ static int chunk_num = 0; /* actual number of low mem segments */ #ifdef DIAGNOSTIC -int isadma_alloc_cur = 0; -int isadma_alloc_max = 0; +int bounce_alloc_cur = 0; +int bounce_alloc_max = 0; #endif -vm_offset_t isadma_mem; /* base address (virtual) of low mem arena */ -int isadma_pages; /* number of pages of low mem arena */ - -/* - * called from cpu_startup to setup the bounce buffer. - */ -void -isadma_init() -{ - struct pglist pglist; - vm_size_t sz; - vm_page_t pg; - vm_offset_t off; - - TAILQ_INIT(&pglist); - - /* - * Get some continuous physical memory situated below 16MB as that is - * the ISA DMA limit. - */ - isadma_pages = - ctob(physmem) >= 0x1000000 ? DMA_BOUNCE : DMA_BOUNCE_LOW; - sz = isadma_pages << PGSHIFT; - if (vm_page_alloc_memory(sz, 0, 0x1000000, 0, 0, &pglist, 1, 0)) - panic("isadma_init: no physical memory for bounce buffer"); - - /* - * Find some space in the kernel virtual memory for our bounce buffer. - */ - isadma_mem = vm_map_min(kernel_map); - if (vm_map_find(kernel_map, NULL, 0, &isadma_mem, sz, TRUE)) - panic("isadma_init: no virtual memory for bounce buffer"); - - /* - * Now map the physical bounce buffer into the virtual addresspace. - */ - for (pg = pglist.tqh_first, off = isadma_mem; pg != NULL; - pg = pg->pageq.tqe_next, off += PAGE_SIZE) - pmap_enter(pmap_kernel(), off, VM_PAGE_TO_PHYS(pg), - VM_PROT_DEFAULT, TRUE); - - /* - * Finally, wire it down so it never will be paged out. - * XXX Is this really needed? we have already told pmap_enter. - */ - vm_map_pageable(kernel_map, isadma_mem, isadma_mem + sz, FALSE); - -#if 0 - printf("ISA DMA bounce buffer: pa 0x%08x va 0x%08x sz 0x%08x", - VM_PAGE_TO_PHYS(pglist.tqh_first), isadma_mem, sz); -#endif -} +vm_offset_t isaphysmem; /* base address of low mem arena */ +int isaphysmempgs; /* number of pages of low mem arena */ /* * if addr is the physical address of an allocated bounce buffer return the * corresponding virtual address, 0 otherwise */ + + caddr_t -isadma_vaddr(addr) +bounce_vaddr(addr) vm_offset_t addr; { int i; - if (addr < vtophys(isadma_mem) || - addr >= vtophys(isadma_mem + chunk_num * chunk_size) || - ((i = (int)(addr-vtophys(isadma_mem))) % chunk_size) != 0 || + if (addr < vtophys(isaphysmem) || + addr >= vtophys(isaphysmem + chunk_num*chunk_size) || + ((i = (int)(addr-vtophys(isaphysmem))) % chunk_size) != 0 || bit(i/chunk_size)) - return (0); + return(0); - return ((caddr_t)(isadma_mem + (addr - vtophys(isadma_mem)))); + return((caddr_t) (isaphysmem + (addr - vtophys(isaphysmem)))); } /* - * Allocate a low mem segment of size nbytes. Alignment constraint is: + * alloc a low mem segment of size nbytes. Alignment constraint is: * (addr & pmask) == ((addr+size-1) & pmask) - * If waitok, call may wait for memory to become available. - * Returns 0 on failure. + * if waitok, call may wait for memory to become available. + * returns 0 on failure */ + vm_offset_t -isadma_alloc(nbytes, pmask, waitok) +bounce_alloc(nbytes, pmask, waitok) vm_size_t nbytes; vm_offset_t pmask; int waitok; @@ -453,25 +408,25 @@ isadma_alloc(nbytes, pmask, waitok) opri = splbio(); if (bit_ptr < 0) { /* initialize low mem arena */ - if ((chunk_size = isadma_pages * NBPG / MAX_CHUNK) & 1) + if ((chunk_size = isaphysmempgs*NBPG/MAX_CHUNK) & 1) chunk_size--; - chunk_num = (isadma_pages * NBPG) / chunk_size; + chunk_num = (isaphysmempgs*NBPG) / chunk_size; for(i = 0; i < chunk_num; i++) set(i); bit_ptr = 0; } - nunits = (nbytes + chunk_size - 1) / chunk_size; + nunits = (nbytes+chunk_size-1)/chunk_size; /* * set a=start, b=start with address constraints, c=end * check if this request may ever succeed. */ - a = isadma_mem; - b = (isadma_mem + ~pmask) & pmask; - c = isadma_mem + chunk_num * chunk_size; - n = nunits * chunk_size; + a = isaphysmem; + b = (isaphysmem + ~pmask) & pmask; + c = isaphysmem + chunk_num*chunk_size; + n = nunits*chunk_size; if (a + n >= c || (pmask != 0 && a + n >= b && b + n >= c)) { splx(opri); return(0); @@ -481,19 +436,16 @@ isadma_alloc(nbytes, pmask, waitok) i = bit_ptr; l = -1; do{ - if (bit(i) && l >= 0 && (i - l + 1) >= nunits) { - r = vtophys(isadma_mem + - (i - nunits + 1) * chunk_size); + if (bit(i) && l >= 0 && (i - l + 1) >= nunits){ + r = vtophys(isaphysmem + (i - nunits + 1)*chunk_size); if (((r ^ (r + nbytes - 1)) & pmask) == 0) { for (l = i - nunits + 1; l <= i; l++) clr(l); bit_ptr = i; #ifdef DIAGNOSTIC - isadma_alloc_cur += - nunits * chunk_size; - isadma_alloc_max = - max(isadma_alloc_max, - isadma_alloc_cur); + bounce_alloc_cur += nunits*chunk_size; + bounce_alloc_max = max(bounce_alloc_max, + bounce_alloc_cur); #endif splx(opri); return(r); @@ -506,10 +458,10 @@ isadma_alloc(nbytes, pmask, waitok) i = 0; l = -1; } - } while (i != bit_ptr); + } while(i != bit_ptr); if (waitok) - tsleep((caddr_t)&bit_ptr, PRIBIO, "physmem", 0); + tsleep((caddr_t) &bit_ptr, PRIBIO, "physmem", 0); else { splx(opri); return(0); @@ -522,7 +474,7 @@ isadma_alloc(nbytes, pmask, waitok) */ void -isadma_free(addr, nbytes) +bounce_free(addr, nbytes) vm_offset_t addr; vm_size_t nbytes; { @@ -531,37 +483,37 @@ isadma_free(addr, nbytes) opri = splbio(); - if ((vaddr = (vm_offset_t)isadma_vaddr(addr)) == 0) - panic("isadma_free: bad address"); + if ((vaddr = (vm_offset_t) bounce_vaddr(addr)) == 0) + panic("bounce_free: bad address"); - i = (int)(vaddr - isadma_mem) / chunk_size; - j = i + (nbytes + chunk_size - 1) / chunk_size; + i = (int) (vaddr - isaphysmem)/chunk_size; + j = i + (nbytes + chunk_size - 1)/chunk_size; #ifdef DIAGNOSTIC - isadma_alloc_cur -= (j - i) * chunk_size; + bounce_alloc_cur -= (j - i)*chunk_size; #endif while (i < j) { if (bit(i)) - panic("isadma_free: already free"); + panic("bounce_free: already free"); set(i); i++; } - wakeup((caddr_t)&bit_ptr); + wakeup((caddr_t) &bit_ptr); splx(opri); } /* * setup (addr, nbytes) for an ISA dma transfer. - * flags & ISADMA_MAP_WAITOK may wait - * flags & ISADMA_MAP_BOUNCE may use a bounce buffer if necessary - * flags & ISADMA_MAP_CONTIG result must be physically contiguous - * flags & ISADMA_MAP_8BIT must not cross 64k boundary - * flags & ISADMA_MAP_16BIT must not cross 128k boundary + * flags&ISADMA_MAP_WAITOK may wait + * flags&ISADMA_MAP_BOUNCE may use a bounce buffer if necessary + * flags&ISADMA_MAP_CONTIG result must be physically contiguous + * flags&ISADMA_MAP_8BIT must not cross 64k boundary + * flags&ISADMA_MAP_16BIT must not cross 128k boundary * * returns the number of used phys entries, 0 on failure. - * if flags & ISADMA_MAP_CONTIG result is 1 on sucess! + * if flags&ISADMA_MAP_CONTIG result is 1 on sucess! */ int @@ -611,14 +563,14 @@ isadma_map(addr, nbytes, phys, flags) if ((flags & ISADMA_MAP_BOUNCE) == 0) phys[seg].addr = 0; else - phys[seg].addr = isadma_alloc(phys[seg].length, - pmask, waitok); + phys[seg].addr = bounce_alloc(phys[seg].length, + pmask, waitok); if (phys[seg].addr == 0) { for (i = 0; i < seg; i++) - if (isadma_vaddr(phys[i].addr)) - isadma_free(phys[i].addr, - phys[i].length); - return (0); + if (bounce_vaddr(phys[i].addr)) + bounce_free(phys[i].addr, + phys[i].length); + return 0; } } @@ -627,11 +579,11 @@ isadma_map(addr, nbytes, phys, flags) /* check all constraints */ if (datalen || - ((phys[0].addr ^ (phys[0].addr + phys[0].length - 1)) & pmask) != - 0 || ((phys[0].addr & 1) && (flags & ISADMA_MAP_16BIT))) { + ((phys[0].addr ^ (phys[0].addr + phys[0].length - 1)) & pmask) != 0 || + ((phys[0].addr & 1) && (flags & ISADMA_MAP_16BIT))) { if ((flags & ISADMA_MAP_BOUNCE) == 0) return 0; - if ((phys[0].addr = isadma_alloc(nbytes, pmask, waitok)) == 0) + if ((phys[0].addr = bounce_alloc(nbytes, pmask, waitok)) == 0) return 0; phys[0].length = nbytes; } @@ -653,8 +605,8 @@ isadma_unmap(addr, nbytes, nphys, phys) int i; for (i = 0; i < nphys; i++) - if (isadma_vaddr(phys[i].addr)) - isadma_free(phys[i].addr, phys[i].length); + if (bounce_vaddr(phys[i].addr)) + bounce_free(phys[i].addr, phys[i].length); } /* @@ -672,7 +624,7 @@ isadma_copyfrombuf(addr, nbytes, nphys, phys) caddr_t vaddr; for (i = 0; i < nphys; i++) { - vaddr = isadma_vaddr(phys[i].addr); + vaddr = bounce_vaddr(phys[i].addr); if (vaddr) bcopy(vaddr, addr, phys[i].length); addr += phys[i].length; @@ -694,7 +646,7 @@ isadma_copytobuf(addr, nbytes, nphys, phys) caddr_t vaddr; for (i = 0; i < nphys; i++) { - vaddr = isadma_vaddr(phys[i].addr); + vaddr = bounce_vaddr(phys[i].addr); if (vaddr) bcopy(addr, vaddr, phys[i].length); addr += phys[i].length; diff --git a/sys/arch/i386/isa/isa_machdep.h b/sys/arch/i386/isa/isa_machdep.h index 8bebed26dfd..e62aefdb0d8 100644 --- a/sys/arch/i386/isa/isa_machdep.h +++ b/sys/arch/i386/isa/isa_machdep.h @@ -110,6 +110,9 @@ void isa_intr_disestablish __P((isa_chipset_tag_t ic, void *handler)); * DMA_BOUNCE is the number of pages of low-addressed physical memory * to acquire for ISA bounce buffers. If physical memory below 16 MB * then DMA_BOUNCE_LOW will be used. + * + * isaphysmem is the address of this physical contiguous low memory. + * isaphysmempgs is the number of pages allocated. */ #ifndef DMA_BOUNCE @@ -120,6 +123,10 @@ void isa_intr_disestablish __P((isa_chipset_tag_t ic, void *handler)); #define DMA_BOUNCE_LOW 16 /* number of pages if memory <= 16M */ #endif +extern vm_offset_t isaphysmem; +extern int isaphysmempgs; + + /* * Variables and macros to deal with the ISA I/O hole. * XXX These should be converted to machine- and bus-mapping-independent @@ -145,6 +152,5 @@ extern u_long atdevbase; /* kernel virtual address of "hole" */ * Miscellanous functions. */ void sysbeep __P((int, int)); /* beep with the system speaker */ -void isadma_init __P((void)); #endif /* _I386_ISA_MACHDEP_H_ XXX */ |