From 1f9a3b0584987f05b7e8560ff6ed59a3d78113e0 Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Mon, 26 Oct 2009 00:31:50 +0100 Subject: Make tuning VM_MAX_ADDRESS trivial * i386/i386/vm_param.h (LINEAR_MIN_KERNEL_ADDRESS): Set to VM_MAX_ADDRESS instead of hardcoding to 0xc0000000. (VM_MAX_KERNEL_ADDRESS): Set to LINEAR_MAX_KERNEL_ADDRESS - LINEAR_MIN_KERNEL_ADDRESS instead of hardcoding to 0x40000000. * i386/include/mach/i386/vm_param.h: Document how it may be tuned. --- i386/i386/vm_param.h | 4 ++-- i386/include/mach/i386/vm_param.h | 9 +++++++-- 2 files changed, 9 insertions(+), 4 deletions(-) (limited to 'i386') diff --git a/i386/i386/vm_param.h b/i386/i386/vm_param.h index 96fc8ba..ba8e584 100644 --- a/i386/i386/vm_param.h +++ b/i386/i386/vm_param.h @@ -28,12 +28,12 @@ /* The kernel address space is 1GB, starting at virtual address 0. */ #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t) 0x00000000) -#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t) 0x40000000) +#define VM_MAX_KERNEL_ADDRESS ((vm_offset_t) (LINEAR_MAX_KERNEL_ADDRESS - LINEAR_MIN_KERNEL_ADDRESS)) /* The kernel virtual address space is actually located at high linear addresses. This is the kernel address range in linear addresses. */ -#define LINEAR_MIN_KERNEL_ADDRESS ((vm_offset_t) 0xc0000000) +#define LINEAR_MIN_KERNEL_ADDRESS ((vm_offset_t) VM_MAX_ADDRESS) #define LINEAR_MAX_KERNEL_ADDRESS ((vm_offset_t) 0xffffffff) #define KERNEL_STACK_SIZE (1*I386_PGBYTES) diff --git a/i386/include/mach/i386/vm_param.h b/i386/include/mach/i386/vm_param.h index a6b1efd..e3cb2e4 100644 --- a/i386/include/mach/i386/vm_param.h +++ b/i386/include/mach/i386/vm_param.h @@ -66,8 +66,13 @@ #define i386_trunc_page(x) (((unsigned)(x)) & ~(I386_PGBYTES-1)) /* User address spaces are 3GB each, - starting at virtual and linear address 0. */ + starting at virtual and linear address 0. + + VM_MAX_ADDRESS can be reduced to leave more space for the kernel, but must + not be increased to more than 3GB as glibc and hurd servers would not cope + with that. + */ #define VM_MIN_ADDRESS ((vm_offset_t) 0) -#define VM_MAX_ADDRESS ((vm_offset_t) 0xc0000000) +#define VM_MAX_ADDRESS ((vm_offset_t) 0x80000000) #endif /* _MACH_I386_VM_PARAM_H_ */ -- cgit v1.2.3