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| author | H. Peter Anvin <hpa@zytor.com> | 2013-03-22 15:19:51 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2013-03-22 15:21:24 -0700 |
| commit | e209e69718f52c5387604a554eedce18b03fd7a9 (patch) | |
| tree | 09ddae5fa86b3a2a5821597b06e95c130f6cae1e | |
| parent | e151e0aa23f83ead8c24f80695fec07f85496afe (diff) | |
| download | virtio9p-master.tar.gz virtio9p-master.tar.xz virtio9p-master.zip | |
Add a minimally functional open implementation
| -rw-r--r-- | int2f.asm | 1 | ||||
| -rw-r--r-- | open.asm | 63 | ||||
| -rw-r--r-- | pathname.asm | 2 |
3 files changed, 60 insertions, 6 deletions
@@ -57,6 +57,7 @@ LPROC(int2f_11) /* it is a redirector call */ pushw %fs pushw %gs + cld movw %cs,%cx movw %cx,%ds movw %ss,prev_stack+2 @@ -25,6 +25,10 @@ * * ----------------------------------------------------------------------- */ +#include "v9fs.h" + .code16 + .section ".rtext","ax" + /* ------------------------------------------------------------------------- * * fxn_create * ------------------------------------------------------------------------- */ @@ -57,9 +61,9 @@ END(fxn_open) * ------------------------------------------------------------------------- */ GPROC(fxn_spopenfile) - lfsw dos_sdafcb,%si - movw %fs:SPN_SPCACTION(%si),%ax /* Open action */ - movw %fs:SPN_SPCMODE(%si),%dx /* Open mode */ + lfsw dos_sdafcb,%bx + movw %fs:SDF_SPCACTION(%bx),%ax /* Open action */ + movw %fs:SDF_SPCMODE(%bx),%dx /* Open mode */ call do_open andw %ax,%ax jnz 1f @@ -72,7 +76,7 @@ END(fxn_spopenfile) * do_open * * Common interface to all the open variants. Take the extended open - * action code in %ax and the open mode in %dx. SDN_FN1 contains the + * action code in %al and the open mode in %dx. SDN_FN1 contains the * fully qualified filename. * * On return, the status code is in %(e)ax and on success an extended @@ -80,6 +84,55 @@ END(fxn_spopenfile) * ------------------------------------------------------------------------- */ LPROC(do_open) - movw $0x08030002,%eax + lfsw dos_sdafn,%si + + pushw %ax /* 8(%bp) Action code */ + pushw %dx /* 6(%bp) Open mode */ + pushw F_ES /* 2(%bp) SFT pointer - also used as FID */ + pushw F_DI + pushw %bp /* (%bp) */ + movw %sp,%bp + + addw $2,%si /* Skip leading drive : */ + + testb $0x03,%al + jz 101f + + /* Open or "replace" */ + movl 2(%bp),%eax + call path_walk_asciiz + jc 101f /* Not found */ + andb %al,%al /* P9_QTFILE = 0x00 */ + jne 102f /* Not a file */ + + movw msgbuf7,%si + movl 2(%bp),%eax + stosl + movzwl 6(%bp),%eax + andb $3,%al /* O_RDONLY, O_WRONLY, O_RDWR */ + movb 8(%bp),%cl + andb $0x2,%cl + orb %cl,%ah /* 0x200 = O_TRUNC */ + stosl + movb $P9_TLOPEN,%al + call simple_message + jc 102f + + /* XXX: Set %cx return status */ + + xorw %ax,%ax /* Success! */ + jmp 100f + +103: + /* Error, but need to clunk */ + movl 2(%bp),%eax + call clunk +101: /* XXX: should handle create!!! */ +102: + /* Error: XXX: handle error code */ + movl $0x08030002,%eax +100: + popw %bp + addw $8,%sp retw END(do_open) diff --git a/pathname.asm b/pathname.asm index 469e607..ff05aa2 100644 --- a/pathname.asm +++ b/pathname.asm @@ -37,7 +37,7 @@ * ------------------------------------------------------------------------- */ GPROC(get_end_path) pushw %ax - xchg %si,%bx + movw %si,%bx 1: fs lodsb andb %al,%al |