66ba8079c7
Allocate proper kernel page table immediately in main using boot allocator Remove pginit Simplify address space layout a tiny bit More to come (e.g., superpages to simplify static table)
27 lines
1 KiB
C
27 lines
1 KiB
C
// Memory layout
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#define PGSIZE 4096 // bytes mapped by a page
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#define PGSHIFT 12 // log2(PGSIZE)
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#define KSTKSIZE (8*PGSIZE) // size of a kernel stack
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#define DEVSPACE 0xFE000000 // other devices are in the top of the phys address space
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#define PHYSTOP 0xE000000 // use phys mem up to here as free pool
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// Key addresses for address space layout (see kmap in vm.c for the layout)
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#define KERNBASE 0xF0000000 // First kernel virtual address
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#define USERTOP (KERNBASE-PGSIZE) // Highest user virtual address
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#define KERNLINK 0xF0100000 // Address where kernel is linked
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#ifndef __ASSEMBLER__
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static inline uint v2p(void *a) { return (uint) a - KERNBASE; }
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static inline void *p2v(uint a) { return (void *) a + KERNBASE; }
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#endif
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#define V2P(a) ((uint) a - KERNBASE)
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#define P2V(a) ((void *) a + KERNBASE)
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#define V2P_WO(x) ((x) - KERNBASE) // same as V2P, but without casts
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#define P2V_WO(x) ((x) + KERNBASE) // same as V2P, but without casts
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