diff options
author | peter <peter@FreeBSD.org> | 2003-05-01 01:05:25 +0000 |
---|---|---|
committer | peter <peter@FreeBSD.org> | 2003-05-01 01:05:25 +0000 |
commit | 45949ccde13fb04ed597a5aef80b678ba16bcab7 (patch) | |
tree | dd665cefeba0e426ad2b212b76851de96f1ad18b /sys/amd64/isa/isa_dma.c | |
parent | 1fd7bc609e9a5249f7b7b558405e1c39aca79796 (diff) | |
download | FreeBSD-src-45949ccde13fb04ed597a5aef80b678ba16bcab7.zip FreeBSD-src-45949ccde13fb04ed597a5aef80b678ba16bcab7.tar.gz |
Commit MD parts of a loosely functional AMD64 port. This is based on
a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to
attempt to get a stable base to start from. There is a lot missing still.
Worth noting:
- The kernel runs at 1GB in order to cheat with the pmap code. pmap uses
a variation of the PAE code in order to avoid having to worry about 4
levels of page tables yet.
- It boots in 64 bit "long mode" with a tiny trampoline embedded in the
i386 loader. This simplifies locore.s greatly.
- There are still quite a few fragments of i386-specific code that have
not been translated yet, and some that I cheated and wrote dumb C
versions of (bcopy etc).
- It has both int 0x80 for syscalls (but using registers for argument
passing, as is native on the amd64 ABI), and the 'syscall' instruction
for syscalls. int 0x80 preserves all registers, 'syscall' does not.
- I have tried to minimize looking at the NetBSD code, except in a couple
of places (eg: to find which register they use to replace the trashed
%rcx register in the syscall instruction). As a result, there is not a
lot of similarity. I did look at NetBSD a few times while debugging to
get some ideas about what I might have done wrong in my first attempt.
Diffstat (limited to 'sys/amd64/isa/isa_dma.c')
-rw-r--r-- | sys/amd64/isa/isa_dma.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sys/amd64/isa/isa_dma.c b/sys/amd64/isa/isa_dma.c index 381bd75..6be4ae0 100644 --- a/sys/amd64/isa/isa_dma.c +++ b/sys/amd64/isa/isa_dma.c @@ -59,7 +59,7 @@ #include <vm/vm.h> #include <vm/vm_param.h> #include <vm/pmap.h> -#include <i386/isa/isa.h> +#include <amd64/isa/isa.h> #include <dev/ic/i8237.h> #include <isa/isavar.h> @@ -79,6 +79,8 @@ #define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ #define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ +#define ISARAM_END 0x1000000 + static int isa_dmarangecheck(caddr_t va, u_int length, int chan); static caddr_t dma_bouncebuf[8]; @@ -382,7 +384,6 @@ isa_dmarangecheck(caddr_t va, u_int length, int chan) endva = (vm_offset_t)round_page((vm_offset_t)va + length); for (; va < (caddr_t) endva ; va += PAGE_SIZE) { phys = trunc_page(pmap_extract(kernel_pmap, (vm_offset_t)va)); -#define ISARAM_END RAM_END if (phys == 0) panic("isa_dmacheck: no physical page present"); if (phys >= ISARAM_END) |