134 lines
2.2 KiB
C
134 lines
2.2 KiB
C
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/kconfig.h>
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#include <sys/kassert.h>
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#include <sys/kdebug.h>
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#include <sys/kmem.h>
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#include <machine/amd64.h>
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#include <machine/amd64op.h>
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#include <machine/pmap.h>
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#include <machine/mp.h>
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#define MAX_XMEM_REGIONS 1024
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typedef struct XMem
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{
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bool inUse;
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uintptr_t base;
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uintptr_t maxLength;
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uintptr_t length;
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} XMem;
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XMem regions[MAX_XMEM_REGIONS];
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void
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XMem_Init()
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{
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int r;
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uintptr_t regionSize = MEM_XMAP_LEN / MAX_XMEM_REGIONS;
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kprintf("Initializing XMEM ... ");
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for (r = 0; r < MAX_XMEM_REGIONS; r++)
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{
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regions[r].inUse = false;
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regions[r].base = MEM_XMAP_BASE + r * regionSize;
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regions[r].maxLength = regionSize;
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regions[r].length = 0;
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}
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kprintf("Done!\n");
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}
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XMem *
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XMem_New()
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{
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int r;
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for (r = 0; r < MAX_XMEM_REGIONS; r++)
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{
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if (!regions[r].inUse) {
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regions[r].inUse = true;
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return ®ions[r];
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}
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}
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return NULL;
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}
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void
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XMem_Destroy(XMem *xmem)
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{
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uintptr_t off;
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PageEntry *entry;
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for (off = 0; off < xmem->length; off += PGSIZE) {
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PMap_SystemLookup(xmem->base + off, &entry, PGSIZE);
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// Compute DM
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// Free Page
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}
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//PMap_SystemUnmap(virt, pages);
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}
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uintptr_t
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XMem_GetBase(XMem *xmem)
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{
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return xmem->base;
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}
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uintptr_t
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XMem_GetLength(XMem *xmem)
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{
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return xmem->length;
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}
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bool
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XMem_Allocate(XMem *xmem, uintptr_t length)
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{
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uint64_t off;
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// We already allocated up to that size
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if (xmem->length > length)
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return true;
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// Allocation too long
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if (length > xmem->maxLength)
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return false;
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for (off = xmem->length; off < length; off += PGSIZE) {
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void *pg = PAlloc_AllocPage();
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if (pg == NULL)
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return false;
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PMap_SystemMap(DMVA2PA((uint64_t)pg), xmem->base + off, 1, 0);
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xmem->length += PGSIZE;
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}
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return true;
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}
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static void
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Debug_XMemStats(int argc, const char *argv[])
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{
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int r;
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kprintf("Region Nr: %16s %16s\n", "Base", "Length");
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for (r = 0; r < MAX_XMEM_REGIONS; r++)
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{
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if (regions[r].inUse) {
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kprintf("Region %2d: %016llx %016llx\n", r,
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regions[r].base, regions[r].length);
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}
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}
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}
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REGISTER_DBGCMD(xmemstats, "XMem statistics", Debug_XMemStats);
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