---

yaml --- r: 17050 b: refs/heads/master c: 64ca900 h: refs/heads/master v: v3
git-mirror · Jan 9, 2006 · 5211b54 · 5211b54
1 parent adaad80
commit 5211b54
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Showing 8 changed files with 38 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 708e9a794cf8822b760edaccd9053edb07c34d19
+refs/heads/master: 64ca9004b819ab87648dbfc78f3ef49ee491343e
diff --git a/trunk/arch/i386/kernel/Makefile b/trunk/arch/i386/kernel/Makefile
@@ -4,7 +4,7 @@
 
 extra-y := head.o init_task.o vmlinux.lds
 
-obj-y	:= process.o semaphore.o signal.o entry.o traps.o irq.o vm86.o \
+obj-y	:= process.o semaphore.o signal.o entry.o traps.o irq.o \
 		ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_i386.o \
 		pci-dma.o i386_ksyms.o i387.o dmi_scan.o bootflag.o \
 		quirks.o i8237.o
@@ -34,6 +34,7 @@ obj-$(CONFIG_ACPI_SRAT) 	+= srat.o
 obj-$(CONFIG_HPET_TIMER) 	+= time_hpet.o
 obj-$(CONFIG_EFI) 		+= efi.o efi_stub.o
 obj-$(CONFIG_DOUBLEFAULT) 	+= doublefault.o
+obj-$(CONFIG_VM86)		+= vm86.o
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 
 EXTRA_AFLAGS   := -traditional

diff --git a/trunk/arch/i386/kernel/entry.S b/trunk/arch/i386/kernel/entry.S
@@ -323,13 +323,15 @@ work_notifysig:				# deal with pending signals and
 
 	ALIGN
 work_notifysig_v86:
+#ifdef CONFIG_VM86
 	pushl %ecx			# save ti_flags for do_notify_resume
 	call save_v86_state		# %eax contains pt_regs pointer
 	popl %ecx
 	movl %eax, %esp
 	xorl %edx, %edx
 	call do_notify_resume
 	jmp resume_userspace
+#endif
 
 	# perform syscall exit tracing
 	ALIGN

diff --git a/trunk/arch/i386/kernel/process.c b/trunk/arch/i386/kernel/process.c
@@ -48,6 +48,7 @@
 #include <asm/processor.h>
 #include <asm/i387.h>
 #include <asm/desc.h>
+#include <asm/vm86.h>
 #ifdef CONFIG_MATH_EMULATION
 #include <asm/math_emu.h>
 #endif

diff --git a/trunk/include/asm-i386/irq.h b/trunk/include/asm-i386/irq.h
@@ -21,8 +21,6 @@ static __inline__ int irq_canonicalize(int irq)
 	return ((irq == 2) ? 9 : irq);
 }
 
-extern void release_vm86_irqs(struct task_struct *);
-
 #ifdef CONFIG_X86_LOCAL_APIC
 # define ARCH_HAS_NMI_WATCHDOG		/* See include/linux/nmi.h */
 #endif

diff --git a/trunk/include/asm-i386/vm86.h b/trunk/include/asm-i386/vm86.h
@@ -16,7 +16,11 @@
 #define IF_MASK		0x00000200
 #define IOPL_MASK	0x00003000
 #define NT_MASK		0x00004000
+#ifdef CONFIG_VM86
 #define VM_MASK		0x00020000
+#else
+#define VM_MASK		0 /* ignored */
+#endif
 #define AC_MASK		0x00040000
 #define VIF_MASK	0x00080000	/* virtual interrupt flag */
 #define VIP_MASK	0x00100000	/* virtual interrupt pending */
@@ -200,9 +204,25 @@ struct kernel_vm86_struct {
  */
 };
 
+#ifdef CONFIG_VM86
+
 void handle_vm86_fault(struct kernel_vm86_regs *, long);
 int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
 
+struct task_struct;
+void release_vm86_irqs(struct task_struct *);
+
+#else
+
+#define handle_vm86_fault(a, b)
+#define release_vm86_irqs(a)
+
+static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c) {
+	return 0;
+}
+
+#endif /* CONFIG_VM86 */
+
 #endif /* __KERNEL__ */
 
 #endif
diff --git a/trunk/init/Kconfig b/trunk/init/Kconfig
@@ -237,6 +237,16 @@ config UID16
 	help
 	  This enables the legacy 16-bit UID syscall wrappers.
 
+config VM86
+	depends X86
+	default y
+	bool "Enable VM86 support" if EMBEDDED
+	help
+          This option is required by programs like DOSEMU to run 16-bit legacy
+	  code on X86 processors. It also may be needed by software like
+          XFree86 to initialize some video cards via BIOS. Disabling this
+          option saves about 6k.
+
 config CC_OPTIMIZE_FOR_SIZE
 	bool "Optimize for size (Look out for broken compilers!)"
 	default y

diff --git a/trunk/kernel/sys_ni.c b/trunk/kernel/sys_ni.c
@@ -102,6 +102,8 @@ cond_syscall(sys_setresgid16);
 cond_syscall(sys_setresuid16);
 cond_syscall(sys_setreuid16);
 cond_syscall(sys_setuid16);
+cond_syscall(sys_vm86old);
+cond_syscall(sys_vm86);
 
 /* arch-specific weak syscall entries */
 cond_syscall(sys_pciconfig_read);