In gnumach/i386/include/mach/i386/vm_param.h:
/* User address spaces are 3GB each,
starting at virtual and linear address 0. */
#define VM_MIN_ADDRESS ((vm_offset_t) 0)
#define VM_MAX_ADDRESS ((vm_offset_t) 0xc0000000)
In gnumach/i386/i386/vm_param.h:
/* 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)
If user address space is 3 GB and kernel address space is 1 GB,
then the whole vm space is 4 GB, right? However, user address
space and kernel address space both start at 0x00000000. How can
this happen? What exactly is 'linear space' and why are there two
kinds of 'spaces'?
Thanks,
Constantine
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