xmem.c File Reference

#include <stdbool.h>
#include <stdint.h>
#include <sys/kconfig.h>
#include <sys/kassert.h>
#include <sys/kdebug.h>
#include <sys/kmem.h>
#include <machine/amd64.h>
#include <machine/amd64op.h>
#include <machine/pmap.h>
#include <machine/mp.h>

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Data Structures
struct	XMem

Macros
#define	MAX_XMEM_REGIONS   1024

Typedefs
typedef struct XMem	XMem

Functions
void	XMem_Init ()
XMem *	XMem_New ()
void	XMem_Destroy (XMem *xmem)
uintptr_t	XMem_GetBase (XMem *xmem)
uintptr_t	XMem_GetLength (XMem *xmem)
bool	XMem_Allocate (XMem *xmem, uintptr_t length)
static void	Debug_XMemStats (int argc, const char *argv[])
	REGISTER_DBGCMD (xmemstats, "XMem statistics", Debug_XMemStats)

Variables
XMem	regions [MAX_XMEM_REGIONS]

---

Data Structure Documentation

XMem

struct XMem

Definition at line 17 of file xmem.c.

Collaboration diagram for XMem:

Data Fields
uintptr_t	base
bool	inUse
uintptr_t	length
uintptr_t	maxLength

Macro Definition Documentation

MAX_XMEM_REGIONS

#define MAX_XMEM_REGIONS   1024

Definition at line 15 of file xmem.c.

Typedef Documentation

XMem

typedef struct XMem XMem

Function Documentation

Debug_XMemStats()

static void Debug_XMemStats ( int  argc, const char *  argv[]  )

static

Definition at line 118 of file xmem.c.

{
    int r;
 
    kprintf("Region Nr: %16s %16s\n", "Base", "Length");
    for (r = 0; r < MAX_XMEM_REGIONS; r++)
    {
        if (regions[r].inUse) {
            kprintf("Region %2d: %016llx %016llx\n", r,
                    regions[r].base, regions[r].length);
        }
    }
}

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REGISTER_DBGCMD()

REGISTER_DBGCMD	(	xmemstats	,
		"XMem statistics"	,
		Debug_XMemStats
	)

XMem_Allocate()

bool XMem_Allocate	(	XMem *	xmem,
		uintptr_t	length
	)

Definition at line 92 of file xmem.c.

{
    uint64_t off;
 
    // We already allocated up to that size
    if (xmem->length > length)
        return true;
 
    // Allocation too long
    if (length > xmem->maxLength)
        return false;
 
    for (off = xmem->length; off < length; off += PGSIZE) {
        void *pg = PAlloc_AllocPage();
        if (pg == NULL)
            return false;
 
        PMap_SystemMap(DMVA2PA((uint64_t)pg), xmem->base + off, 1, 0);
 
        xmem->length += PGSIZE;
    }
 
    return true;
}

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XMem_Destroy()

void XMem_Destroy

(

XMem *

xmem

)

Definition at line 63 of file xmem.c.

{
    uintptr_t off;
    PageEntry *entry;
 
    for (off = 0; off < xmem->length; off += PGSIZE) {
        PMap_SystemLookup(xmem->base + off, &entry, PGSIZE);
 
        // Compute DM
 
        // Free Page
    }
 
    //PMap_SystemUnmap(virt, pages);
}

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XMem_GetBase()

uintptr_t XMem_GetBase

(

XMem *

xmem

)

Definition at line 80 of file xmem.c.

{
    return xmem->base;
}

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XMem_GetLength()

uintptr_t XMem_GetLength

(

XMem *

xmem

)

Definition at line 86 of file xmem.c.

{
    return xmem->length;
}

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XMem_Init()

void XMem_Init

(

)

Definition at line 28 of file xmem.c.

{
    int r;
    uintptr_t regionSize = MEM_XMAP_LEN / MAX_XMEM_REGIONS;
 
    kprintf("Initializing XMEM ... ");
 
    for (r = 0; r < MAX_XMEM_REGIONS; r++)
    {
        regions[r].inUse = false;
        regions[r].base = MEM_XMAP_BASE + r * regionSize;
        regions[r].maxLength = regionSize;
        regions[r].length = 0;
    }
 
    kprintf("Done!\n");
}

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XMem_New()

XMem * XMem_New

(

)

Definition at line 47 of file xmem.c.

{
    int r;
 
    for (r = 0; r < MAX_XMEM_REGIONS; r++)
    {
        if (!regions[r].inUse) {
            regions[r].inUse = true;
            return &regions[r];
        }
    }
 
    return NULL;
}

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Variable Documentation

regions

XMem regions[MAX_XMEM_REGIONS]

Definition at line 25 of file xmem.c.