diff options
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/i386/i386/machdep.c | 144 |
1 files changed, 142 insertions, 2 deletions
diff --git a/sys/arch/i386/i386/machdep.c b/sys/arch/i386/i386/machdep.c index ee62226a4ee..173c247815e 100644 --- a/sys/arch/i386/i386/machdep.c +++ b/sys/arch/i386/i386/machdep.c @@ -1,4 +1,4 @@ -/* $OpenBSD: machdep.c,v 1.30 1996/12/09 08:36:41 deraadt Exp $ */ +/* $OpenBSD: machdep.c,v 1.31 1996/12/09 09:54:04 niklas Exp $ */ /* $NetBSD: machdep.c,v 1.202 1996/05/18 15:54:59 christos Exp $ */ /*- @@ -153,6 +153,24 @@ extern vm_offset_t avail_start, avail_end; static vm_offset_t hole_start, hole_end; static vm_offset_t avail_next; +/* + * Extent maps to manage I/O and ISA memory hole space. Allocate + * storage for 8 regions in each, initially. Later, ioport_malloc_safe + * will indicate that it's safe to use malloc() to dynamically allocate + * region descriptors. + * + * N.B. At least two regions are _always_ allocated from the iomem + * extent map; (0 -> ISA hole) and (end of ISA hole -> end of RAM). + * + * The extent maps are not static! Machine-dependent ISA and EISA + * routines need access to them for bus address space allocation. + */ +static long ioport_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8) / sizeof(long)]; +static long iomem_ex_storage[EXTENT_FIXED_STORAGE_SIZE(8) / sizeof(long)]; +struct extent *ioport_ex; +struct extent *iomem_ex; +static ioport_malloc_safe; + caddr_t allocsys __P((caddr_t)); void dumpsys __P((void)); void identifycpu __P((void)); @@ -1128,6 +1146,24 @@ init386(first_avail) proc0.p_addr = proc0paddr; + /* + * Initialize the I/O port and I/O mem extent maps. + * Note: we don't have to check the return value since + * creation of a fixed extent map will never fail (since + * descriptor storage has already been allocated). + * + * N.B. The iomem extent manages _all_ physical addresses + * on the machine. When the amount of RAM is found, the two + * extents of RAM are allocated from the map (0 -> ISA hole + * and end of ISA hole -> end of RAM). + */ + ioport_ex = extent_create("ioport", 0x0, 0xffff, M_DEVBUF, + (caddr_t)ioport_ex_storage, sizeof(ioport_ex_storage), + EX_NOCOALESCE|EX_NOWAIT); + iomem_ex = extent_create("iomem", 0x0, 0xffffffff, M_DEVBUF, + (caddr_t)iomem_ex_storage, sizeof(iomem_ex_storage), + EX_NOCOALESCE|EX_NOWAIT); + consinit(); /* XXX SHOULD NOT BE DONE HERE */ /* make gdt gates and memory segments */ @@ -1205,6 +1241,24 @@ init386(first_avail) biosextmem = EXTMEM_SIZE; #endif + /* + * Allocate the physical addresses used by RAM from the iomem + * extent map. This is done before the addresses are + * page rounded just to make sure we get them all. + */ + if (extent_alloc_region(iomem_ex, 0, IOM_BEGIN, EX_NOWAIT)) { + /* XXX What should we do? */ + printf("WARNING: CAN'T ALLOCATE BASE RAM FROM IOMEM EXTENT MAP!\n"); + } + avail_end = biosextmem ? IOM_END + biosextmem * 1024 + : biosbasemem * 1024; /* just temporary use */ + + if (avail_end > IOM_END && extent_alloc_region(iomem_ex, IOM_END, + (avail_end - IOM_END), EX_NOWAIT)) { + /* XXX What should we do? */ + printf("WARNING: CAN'T ALLOCATE EXTENDED MEMORY FROM IOMEM EXTENT MAP!\n"); + } + /* Round down to whole pages. */ biosbasemem &= -(NBPG / 1024); biosextmem &= -(NBPG / 1024); @@ -1471,6 +1525,32 @@ bus_space_map(t, bpa, size, cacheable, bshp) bus_space_handle_t *bshp; { int error; + struct extent *ex; + + /* + * Pick the appropriate extent map. + */ + switch (t) { + case I386_BUS_SPACE_IO: + ex = ioport_ex; + break; + + case I386_BUS_SPACE_MEM: + ex = iomem_ex; + break; + + default: + panic("bus_space_map: bad bus space tag"); + } + + /* + * Before we go any further, let's make sure that this + * region is available. + */ + error = extent_alloc_region(ex, bpa, size, + EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0)); + if (error) + return (error); /* * For I/O space, that's all she wrote. @@ -1485,6 +1565,15 @@ bus_space_map(t, bpa, size, cacheable, bshp) * a kernel virtual address. */ error = bus_mem_add_mapping(bpa, size, cacheable, bshp); + if (error) { + if (extent_free(ex, bpa, size, EX_NOWAIT | + (ioport_malloc_safe ? EX_MALLOCOK : 0))) { + printf("bus_space_map: pa 0x%lx, size 0x%lx\n", + bpa, size); + printf("bus_space_map: can't free region\n"); + } + } + return (error); } @@ -1499,10 +1588,43 @@ bus_space_alloc(t, rstart, rend, size, alignment, boundary, cacheable, bus_addr_t *bpap; bus_space_handle_t *bshp; { + struct extent *ex; u_long bpa; int error; /* + * Pick the appropriate extent map. + */ + switch (t) { + case I386_BUS_SPACE_IO: + ex = ioport_ex; + break; + + case I386_BUS_SPACE_MEM: + ex = iomem_ex; + break; + + default: + panic("bus_space_alloc: bad bus space tag"); + } + + /* + * Sanity check the allocation against the extent's boundaries. + */ + if (rstart < ex->ex_start || rend > ex->ex_end) + panic("bus_space_alloc: bad region start/end"); + + /* + * Do the requested allocation. + */ + error = extent_alloc_subregion(ex, rstart, rend, size, alignment, + boundary, EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0), + &bpa); + + if (error) + return (error); + + /* * For I/O space, that's all she wrote. */ if (t == I386_BUS_SPACE_IO) { @@ -1515,6 +1637,14 @@ bus_space_alloc(t, rstart, rend, size, alignment, boundary, cacheable, * a kernel virtual address. */ error = bus_mem_add_mapping(bpa, size, cacheable, bshp); + if (error) { + if (extent_free(iomem_ex, bpa, size, EX_NOWAIT | + (ioport_malloc_safe ? EX_MALLOCOK : 0))) { + printf("bus_space_alloc: pa 0x%lx, size 0x%lx\n", + bpa, size); + printf("bus_space_alloc: can't free region\n"); + } + } *bpap = bpa; @@ -1563,18 +1693,21 @@ bus_space_unmap(t, bsh, size) bus_space_handle_t bsh; bus_size_t size; { + struct extent *ex; u_long va, endva; bus_addr_t bpa; /* - * Find the correct bus physical address. + * Find the correct extent and bus physical address. */ switch (t) { case I386_BUS_SPACE_IO: + ex = ioport_ex; bpa = bsh; break; case I386_BUS_SPACE_MEM: + ex = iomem_ex; va = i386_trunc_page(bsh); endva = i386_round_page((bsh + size) - 1); @@ -1594,6 +1727,13 @@ bus_space_unmap(t, bsh, size) default: panic("bus_space_unmap: bad bus space tag"); } + + if (extent_free(ex, bpa, size, + EX_NOWAIT | (ioport_malloc_safe ? EX_MALLOCOK : 0))) { + printf("bus_space_unmap: %s 0x%lx, size 0x%lx\n", + (t == I386_BUS_SPACE_IO) ? "port" : "pa", bpa, size); + printf("bus_space_unmap: can't free region\n"); + } } void |