Commit 64ca9004 authored by Matt Mackall's avatar Matt Mackall Committed by Linus Torvalds
Browse files

[PATCH] Make vm86 support optional 



This adds an option to remove vm86 support under CONFIG_EMBEDDED.  Saves
about 5k.

This version eliminates most of the #ifdefs of the previous version and
instead uses function stubs in vm86.h.  Also, release_vm86_irqs is moved
from asm-i386/irq.h to a more appropriate home in vm86.h so that the stubs
can live together.

$ size vmlinux-baseline vmlinux-novm86
   text    data     bss     dec     hex filename
2920821  523232  190652 3634705  377611 vmlinux-baseline
2916268  523100  190492 3629860  376324 vmlinux-novm86

Signed-off-by: default avatarMatt Mackall <mpm@selenic.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 708e9a79

arch/i386/kernel/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -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

arch/i386/kernel/entry.S

+2 −0
Original line number Diff line number Diff line
@@ -323,6 +323,7 @@ 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
@@ -330,6 +331,7 @@ work_notifysig_v86: 
	xorl %edx, %edx

	call do_notify_resume

	jmp resume_userspace

#endif



	# perform syscall exit tracing

	ALIGN

arch/i386/kernel/process.c

+1 −0
Original line number Diff line number Diff line
@@ -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

include/asm-i386/irq.h

+0 −2
Original line number Diff line number Diff line
@@ -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

include/asm-i386/vm86.h

+20 −0
Original line number Diff line number Diff line
@@ -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

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