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Removing the `iopl' device and i/o emulation facility
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From: |
Thomas Schwinge |
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Subject: |
Removing the `iopl' device and i/o emulation facility |
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Date: |
Sun, 1 Apr 2007 22:17:37 +0200 |
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User-agent: |
Mutt/1.5.11 |
Hello!
I'm working towards integrating the OskitMach i/o permissions interface
(i386_io_perm_create, i386_io_perm_modify) into GNU Mach and again
started some spring-cleaning, removing for now the `iopl' device and the
i/o emulation facility. What might the latter have been useful for?
Here is my patch, comment quickly or it will be gone. Gianluca, is this
what you had done / had in mind?
#v+
2007-04-01 Thomas Schwinge <tschwinge@gnu.org>
* i386/i386/io_emulate.c: Remove file.
* i386/i386/io_emulate.h: Likewise.
* i386/i386at/iopl.c: Likewise.
* i386/Makefrag.am (libkernel_a_SOURCES): Remove the aforementioned
files.
* i386/i386/trap.c: Don't include <i386/io_emulate.h>.
(v86_assist, check_io_fault): Remove functions.
(user_trap): Remove the code referencing the above functions.
* i386/i386at/conf.c (dev_name_list): Remove the `iopl' device.
Index: i386/Makefrag.am
===================================================================
RCS file: /cvsroot/hurd/gnumach/i386/Attic/Makefrag.am,v
retrieving revision 1.1.2.8
diff -u -p -r1.1.2.8 Makefrag.am
--- i386/Makefrag.am 27 Mar 2007 22:47:09 -0000 1.1.2.8
+++ i386/Makefrag.am 1 Apr 2007 20:04:26 -0000
@@ -32,7 +32,6 @@ libkernel_a_SOURCES += \
i386/i386at/immc.c \
i386/i386at/int_init.c \
i386/i386at/interrupt.S \
- i386/i386at/iopl.c \
i386/i386at/kd.c \
i386/i386at/kd.h \
i386/i386at/kd_event.c \
@@ -85,8 +84,6 @@ libkernel_a_SOURCES += \
i386/i386/idt-gen.h \
i386/i386/idt.c \
i386/i386/idt_inittab.S \
- i386/i386/io_emulate.c \
- i386/i386/io_emulate.h \
i386/i386/io_map.c \
i386/i386/io_port.h \
i386/i386/iopb.c \
cvs diff: i386/i386/io_emulate.c was removed, no comparison available
cvs diff: i386/i386/io_emulate.h was removed, no comparison available
Index: i386/i386/trap.c
===================================================================
RCS file: /cvsroot/hurd/gnumach/i386/i386/trap.c,v
retrieving revision 1.5.2.8
diff -u -p -r1.5.2.8 trap.c
--- i386/i386/trap.c 6 Jan 2007 14:27:21 -0000 1.5.2.8
+++ i386/i386/trap.c 1 Apr 2007 20:04:26 -0000
@@ -50,8 +50,6 @@
#include <kern/sched.h>
#include <kern/sched_prim.h>
-#include <i386/io_emulate.h>
-
#if MACH_KDB
#include <ddb/db_run.h>
#include <ddb/db_watch.h>
@@ -385,15 +383,6 @@ int user_trap(regs)
printf("user trap %d error %d sub %08x\n", type, code, subcode);
#endif
- if (regs->efl & EFL_VM) {
- /*
- * If hardware assist can handle exception,
- * continue execution.
- */
- if (v86_assist(thread, regs))
- return 0;
- }
-
type = regs->trapno;
code = 0;
subcode = 0;
@@ -497,10 +486,6 @@ printf("user trap %d error %d sub %08x\n
break;
case T_GENERAL_PROTECTION:
- if (!(regs->efl & EFL_VM)) {
- if (check_io_fault(regs))
- return 0;
- }
/* Check for an emulated int80 system call.
NetBSD-current and Linux use trap instead of call gate. */
if (thread->task->eml_dispatch) {
@@ -585,400 +570,6 @@ boolean_t v86_do_sti_immediate = FALSE;
int cli_count = 0;
int sti_count = 0;
-boolean_t
-v86_assist(thread, regs)
- thread_t thread;
- register struct i386_saved_state *regs;
-{
- register struct v86_assist_state *v86 = &thread->pcb->ims.v86s;
-
-/*
- * Build an 8086 address. Use only when off is known to be 16 bits.
- */
-#define Addr8086(seg,off) ((((seg) & 0xffff) << 4) + (off))
-
-#define EFL_V86_SAFE ( EFL_OF | EFL_DF | EFL_TF \
- | EFL_SF | EFL_ZF | EFL_AF \
- | EFL_PF | EFL_CF )
- struct iret_32 {
- int eip;
- int cs;
- int eflags;
- };
- struct iret_16 {
- unsigned short ip;
- unsigned short cs;
- unsigned short flags;
- };
- union iret_struct {
- struct iret_32 iret_32;
- struct iret_16 iret_16;
- };
-
- struct int_vec {
- unsigned short ip;
- unsigned short cs;
- };
-
- if (!v86_assist_on)
- return FALSE;
-
- /*
- * If delayed STI pending, enable interrupts.
- * Turn off tracing if on only to delay STI.
- */
- if (v86->flags & V86_IF_PENDING) {
- v86->flags &= ~V86_IF_PENDING;
- v86->flags |= EFL_IF;
- if ((v86->flags & EFL_TF) == 0)
- regs->efl &= ~EFL_TF;
- }
-
- if (regs->trapno == T_DEBUG) {
-
- if (v86->flags & EFL_TF) {
- /*
- * Trace flag was also set - it has priority
- */
- return FALSE; /* handle as single-step */
- }
- /*
- * Fall through to check for interrupts.
- */
- }
- else if (regs->trapno == T_GENERAL_PROTECTION) {
- /*
- * General protection error - must be an 8086 instruction
- * to emulate.
- */
- register int eip;
- boolean_t addr_32 = FALSE;
- boolean_t data_32 = FALSE;
- int io_port;
-
- /*
- * Set up error handler for bad instruction/data
- * fetches.
- */
- asm("movl $(addr_error), %0" : "=m" (thread->recover));
-
- eip = regs->eip;
- while (TRUE) {
- unsigned char opcode;
-
- if (eip > 0xFFFF) {
- thread->recover = 0;
- return FALSE; /* GP fault: IP out of range */
- }
-
- opcode = *(unsigned char *)Addr8086(regs->cs,eip);
- eip++;
- switch (opcode) {
- case 0xf0: /* lock */
- case 0xf2: /* repne */
- case 0xf3: /* repe */
- case 0x2e: /* cs */
- case 0x36: /* ss */
- case 0x3e: /* ds */
- case 0x26: /* es */
- case 0x64: /* fs */
- case 0x65: /* gs */
- /* ignore prefix */
- continue;
-
- case 0x66: /* data size */
- data_32 = TRUE;
- continue;
-
- case 0x67: /* address size */
- addr_32 = TRUE;
- continue;
-
- case 0xe4: /* inb imm */
- case 0xe5: /* inw imm */
- case 0xe6: /* outb imm */
- case 0xe7: /* outw imm */
- io_port = *(unsigned char *)Addr8086(regs->cs, eip);
- eip++;
- goto do_in_out;
-
- case 0xec: /* inb dx */
- case 0xed: /* inw dx */
- case 0xee: /* outb dx */
- case 0xef: /* outw dx */
- case 0x6c: /* insb */
- case 0x6d: /* insw */
- case 0x6e: /* outsb */
- case 0x6f: /* outsw */
- io_port = regs->edx & 0xffff;
-
- do_in_out:
- if (!data_32)
- opcode |= 0x6600; /* word IO */
-
- switch (emulate_io(regs, opcode, io_port)) {
- case EM_IO_DONE:
- /* instruction executed */
- break;
- case EM_IO_RETRY:
- /* port mapped, retry instruction */
- thread->recover = 0;
- return TRUE;
- case EM_IO_ERROR:
- /* port not mapped */
- thread->recover = 0;
- return FALSE;
- }
- break;
-
- case 0xfa: /* cli */
- if (!v86_do_sti_cli) {
- thread->recover = 0;
- return (FALSE);
- }
-
- v86->flags &= ~EFL_IF;
- /* disable simulated interrupts */
- cli_count++;
- break;
-
- case 0xfb: /* sti */
- if (!v86_do_sti_cli) {
- thread->recover = 0;
- return (FALSE);
- }
-
- if ((v86->flags & EFL_IF) == 0) {
- if (v86_do_sti_immediate) {
- v86->flags |= EFL_IF;
- } else {
- v86->flags |= V86_IF_PENDING;
- regs->efl |= EFL_TF;
- }
- /* single step to set IF next inst. */
- }
- sti_count++;
- break;
-
- case 0x9c: /* pushf */
- {
- int flags;
- vm_offset_t sp;
- int size;
-
- flags = regs->efl;
- if ((v86->flags & EFL_IF) == 0)
- flags &= ~EFL_IF;
-
- if ((v86->flags & EFL_TF) == 0)
- flags &= ~EFL_TF;
- else flags |= EFL_TF;
-
- sp = regs->uesp;
- if (!addr_32)
- sp &= 0xffff;
- else if (sp > 0xffff)
- goto stack_error;
- size = (data_32) ? 4 : 2;
- if (sp < size)
- goto stack_error;
- sp -= size;
- if (copyout((char *)&flags,
- (char *)Addr8086(regs->ss,sp),
- size))
- goto addr_error;
- if (addr_32)
- regs->uesp = sp;
- else
- regs->uesp = (regs->uesp & 0xffff0000) | sp;
- break;
- }
-
- case 0x9d: /* popf */
- {
- vm_offset_t sp;
- int nflags;
-
- sp = regs->uesp;
- if (!addr_32)
- sp &= 0xffff;
- else if (sp > 0xffff)
- goto stack_error;
-
- if (data_32) {
- if (sp > 0xffff - sizeof(int))
- goto stack_error;
- nflags = *(int *)Addr8086(regs->ss,sp);
- sp += sizeof(int);
- }
- else {
- if (sp > 0xffff - sizeof(short))
- goto stack_error;
- nflags = *(unsigned short *)
- Addr8086(regs->ss,sp);
- sp += sizeof(short);
- }
- if (addr_32)
- regs->uesp = sp;
- else
- regs->uesp = (regs->uesp & 0xffff0000) | sp;
-
- if (v86->flags & V86_IRET_PENDING) {
- v86->flags = nflags & (EFL_TF | EFL_IF);
- v86->flags |= V86_IRET_PENDING;
- } else {
- v86->flags = nflags & (EFL_TF | EFL_IF);
- }
- regs->efl = (regs->efl & ~EFL_V86_SAFE)
- | (nflags & EFL_V86_SAFE);
- break;
- }
- case 0xcf: /* iret */
- {
- vm_offset_t sp;
- int nflags;
- union iret_struct iret_struct;
-
- v86->flags &= ~V86_IRET_PENDING;
- sp = regs->uesp;
- if (!addr_32)
- sp &= 0xffff;
- else if (sp > 0xffff)
- goto stack_error;
-
- if (data_32) {
- if (sp > 0xffff - sizeof(struct iret_32))
- goto stack_error;
- iret_struct.iret_32 =
- *(struct iret_32 *) Addr8086(regs->ss,sp);
- sp += sizeof(struct iret_32);
- }
- else {
- if (sp > 0xffff - sizeof(struct iret_16))
- goto stack_error;
- iret_struct.iret_16 =
- *(struct iret_16 *) Addr8086(regs->ss,sp);
- sp += sizeof(struct iret_16);
- }
- if (addr_32)
- regs->uesp = sp;
- else
- regs->uesp = (regs->uesp & 0xffff0000) | sp;
-
- if (data_32) {
- eip = iret_struct.iret_32.eip;
- regs->cs = iret_struct.iret_32.cs & 0xffff;
- nflags = iret_struct.iret_32.eflags;
- }
- else {
- eip = iret_struct.iret_16.ip;
- regs->cs = iret_struct.iret_16.cs;
- nflags = iret_struct.iret_16.flags;
- }
-
- v86->flags = nflags & (EFL_TF | EFL_IF);
- regs->efl = (regs->efl & ~EFL_V86_SAFE)
- | (nflags & EFL_V86_SAFE);
- break;
- }
- default:
- /*
- * Instruction not emulated here.
- */
- thread->recover = 0;
- return FALSE;
- }
- break; /* exit from 'while TRUE' */
- }
- regs->eip = (regs->eip & 0xffff0000 | eip);
- }
- else {
- /*
- * Not a trap we handle.
- */
- thread->recover = 0;
- return FALSE;
- }
-
- if ((v86->flags & EFL_IF) && ((v86->flags & V86_IRET_PENDING)==0)) {
-
- struct v86_interrupt_table *int_table;
- int int_count;
- int vec;
- int i;
-
- int_table = (struct v86_interrupt_table *) v86->int_table;
- int_count = v86->int_count;
-
- vec = 0;
- for (i = 0; i < int_count; int_table++, i++) {
- if (!int_table->mask && int_table->count > 0) {
- int_table->count--;
- vec = int_table->vec;
- break;
- }
- }
- if (vec != 0) {
- /*
- * Take this interrupt
- */
- vm_offset_t sp;
- struct iret_16 iret_16;
- struct int_vec int_vec;
-
- sp = regs->uesp & 0xffff;
- if (sp < sizeof(struct iret_16))
- goto stack_error;
- sp -= sizeof(struct iret_16);
- iret_16.ip = regs->eip;
- iret_16.cs = regs->cs;
- iret_16.flags = regs->efl & 0xFFFF;
- if ((v86->flags & EFL_TF) == 0)
- iret_16.flags &= ~EFL_TF;
- else iret_16.flags |= EFL_TF;
-
-#ifdef gcc_1_36_worked
- int_vec = ((struct int_vec *)0)[vec];
-#else
- memcpy(&int_vec,
- (void *)(sizeof(struct int_vec) * vec),
- sizeof (struct int_vec));
-#endif
- if (copyout((char *)&iret_16,
- (char *)Addr8086(regs->ss,sp),
- sizeof(struct iret_16)))
- goto addr_error;
- regs->uesp = (regs->uesp & 0xFFFF0000) | (sp & 0xffff);
- regs->eip = int_vec.ip;
- regs->cs = int_vec.cs;
- regs->efl &= ~EFL_TF;
- v86->flags &= ~(EFL_IF | EFL_TF);
- v86->flags |= V86_IRET_PENDING;
- }
- }
-
- thread->recover = 0;
- return TRUE;
-
- /*
- * On address error, report a page fault.
- * XXX report GP fault - we don`t save
- * the faulting address.
- */
- addr_error:
- asm("addr_error:;");
- thread->recover = 0;
- return FALSE;
-
- /*
- * On stack address error, return stack fault (12).
- */
- stack_error:
- thread->recover = 0;
- regs->trapno = T_STACK_FAULT;
- return FALSE;
-}
-
/*
* Handle AST traps for i386.
* Check for delayed floating-point exception from
@@ -1039,81 +630,6 @@ i386_exception(exc, code, subcode)
/*NOTREACHED*/
}
-boolean_t
-check_io_fault(regs)
- struct i386_saved_state *regs;
-{
- int eip, opcode, io_port;
- boolean_t data_16 = FALSE;
-
- /*
- * Get the instruction.
- */
- eip = regs->eip;
-
- for (;;) {
- opcode = inst_fetch(eip, regs->cs);
- eip++;
- switch (opcode) {
- case 0x66: /* data-size prefix */
- data_16 = TRUE;
- continue;
-
- case 0xf3: /* rep prefix */
- case 0x26: /* es */
- case 0x2e: /* cs */
- case 0x36: /* ss */
- case 0x3e: /* ds */
- case 0x64: /* fs */
- case 0x65: /* gs */
- continue;
-
- case 0xE4: /* inb imm */
- case 0xE5: /* inl imm */
- case 0xE6: /* outb imm */
- case 0xE7: /* outl imm */
- /* port is immediate byte */
- io_port = inst_fetch(eip, regs->cs);
- eip++;
- break;
-
- case 0xEC: /* inb dx */
- case 0xED: /* inl dx */
- case 0xEE: /* outb dx */
- case 0xEF: /* outl dx */
- case 0x6C: /* insb */
- case 0x6D: /* insl */
- case 0x6E: /* outsb */
- case 0x6F: /* outsl */
- /* port is in DX register */
- io_port = regs->edx & 0xFFFF;
- break;
-
- default:
- return FALSE;
- }
- break;
- }
-
- if (data_16)
- opcode |= 0x6600; /* word IO */
-
- switch (emulate_io(regs, opcode, io_port)) {
- case EM_IO_DONE:
- /* instruction executed */
- regs->eip = eip;
- return TRUE;
-
- case EM_IO_RETRY:
- /* port mapped, retry instruction */
- return TRUE;
-
- case EM_IO_ERROR:
- /* port not mapped */
- return FALSE;
- }
-}
-
#if MACH_PCSAMPLE > 0
/*
* return saved state for interrupted user thread
Index: i386/i386at/conf.c
===================================================================
RCS file: /cvsroot/hurd/gnumach/i386/i386at/Attic/conf.c,v
retrieving revision 1.4.2.14
diff -u -p -r1.4.2.14 conf.c
--- i386/i386at/conf.c 24 Mar 2007 00:01:35 -0000 1.4.2.14
+++ i386/i386at/conf.c 1 Apr 2007 20:04:26 -0000
@@ -58,10 +58,6 @@ extern int kbdgetstat(), kbdsetstat();
extern int mouseopen(), mouseclose(), mouseread(), mousegetstat();
#define mousename "mouse"
-extern int ioplopen(), ioplclose();
-extern vm_offset_t ioplmmap();
-#define ioplname "iopl"
-
extern int kmsgopen(), kmsgclose(), kmsgread(), kmsggetstat();
#define kmsgname "kmsg"
@@ -117,11 +113,6 @@ struct dev_ops dev_name_list[] =
nodev, nulldev, nulldev, 0,
nodev },
- { ioplname, ioplopen, ioplclose, nodev,
- nodev, nodev, nodev, ioplmmap,
- nodev, nulldev, nulldev, 0,
- nodev },
-
#ifdef MACH_KMSG
{ kmsgname, kmsgopen, kmsgclose, kmsgread,
nodev, kmsggetstat, nodev, nomap,
cvs diff: i386/i386at/iopl.c was removed, no comparison available
#v-
Regards,
Thomas
signature.asc
Description: Digital signature
- Removing the `iopl' device and i/o emulation facility,
Thomas Schwinge <=