diff options
| -rw-r--r-- | i386/i386/vm_param.h | 5 | ||||
| -rw-r--r-- | i386/i386at/model_dep.c | 11 | ||||
| -rw-r--r-- | i386/intel/pmap.c | 6 |
3 files changed, 12 insertions, 10 deletions
diff --git a/i386/i386/vm_param.h b/i386/i386/vm_param.h index 95df604..b515a9e 100644 --- a/i386/i386/vm_param.h +++ b/i386/i386/vm_param.h @@ -27,7 +27,7 @@ #include <mach/vm_param.h> #include <xen/public/xen.h> -/* The kernel address space is 1GB, starting at virtual address 0. */ +/* The kernel address space is usually 1GB, usually starting at virtual address 0. */ #ifdef MACH_XEN #define VM_MIN_KERNEL_ADDRESS 0x20000000UL #else /* MACH_XEN */ @@ -45,6 +45,9 @@ #define VM_MAX_KERNEL_ADDRESS (LINEAR_MAX_KERNEL_ADDRESS - LINEAR_MIN_KERNEL_ADDRESS + VM_MIN_KERNEL_ADDRESS) #endif /* MACH_XEN */ +/* Reserve mapping room for kmem_suballoc calls. */ +#define VM_KERNEL_MAP_SIZE (192 * 1024 * 1024) + /* The kernel virtual address space is actually located at high linear addresses. This is the kernel address range in linear addresses. */ diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c index 4e7093c..f6e797c 100644 --- a/i386/i386at/model_dep.c +++ b/i386/i386at/model_dep.c @@ -261,6 +261,8 @@ void db_reset_cpu(void) void mem_size_init(void) { + vm_offset_t max_phys_size; + /* Physical memory on all PCs starts at physical address 0. XX make it a constant. */ phys_first_addr = 0; @@ -285,12 +287,13 @@ mem_size_init(void) printf("AT386 boot: physical memory from 0x%x to 0x%x\n", phys_first_addr, phys_last_addr); - /* Reserve 1/6 of the memory address space for virtual mappings. + /* Reserve room for virtual mappings. * Yes, this loses memory. Blame i386. */ - if (phys_last_addr > ((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 6) * 5) { - phys_last_addr = ((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 6) * 5; + max_phys_size = VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS - VM_KERNEL_MAP_SIZE; + if (phys_last_addr - phys_first_addr > max_phys_size) { + phys_last_addr = phys_first_addr + max_phys_size; printf("Truncating memory size to %dMiB\n", (phys_last_addr - phys_first_addr) / (1024 * 1024)); - /* TODO Xen: free lost memory */ + /* TODO Xen: be nice, free lost memory */ } phys_first_addr = round_page(phys_first_addr); diff --git a/i386/intel/pmap.c b/i386/intel/pmap.c index 0b8ae90..c15538f 100644 --- a/i386/intel/pmap.c +++ b/i386/intel/pmap.c @@ -155,9 +155,6 @@ boolean_t pmap_initialized = FALSE; vm_offset_t kernel_virtual_start; vm_offset_t kernel_virtual_end; -/* XXX stupid fixed limit - get rid */ -vm_size_t morevm = 128 * 1024 * 1024; /* VM space for kernel map */ - /* * Index into pv_head table, its lock bits, and the modify/reference * bits starting at phys_first_addr. @@ -620,8 +617,7 @@ void pmap_bootstrap() * and extends to a stupid arbitrary limit beyond that. */ kernel_virtual_start = phystokv(phys_last_addr); - kernel_virtual_end = phystokv(phys_last_addr) + morevm - + (phys_last_addr - phys_first_addr); + kernel_virtual_end = phystokv(phys_last_addr) + VM_KERNEL_MAP_SIZE; if (kernel_virtual_end < kernel_virtual_start || kernel_virtual_end > VM_MAX_KERNEL_ADDRESS) |