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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
enum
{
Hdrspc = 64, /* leave room for high-level headers */
Bdead = 0x51494F42, /* "QIOB" */
};
struct
{
Lock;
ulong bytes;
} ialloc;
/*
* allocate blocks (round data base address to 64 bit boundary).
* if mallocz gives us more than we asked for, leave room at the front
* for header.
*/
Block*
_allocb(int size)
{
Block *b;
ulong addr;
int n;
b = mallocz(sizeof(Block)+size+Hdrspc+(BY2V-1), 0);
if(b == nil)
return nil;
b->next = nil;
b->list = nil;
b->free = nil;
b->flag = 0;
addr = (ulong)b;
addr = ROUND(addr + sizeof(Block), BY2V);
b->base = (uchar*)addr;
b->lim = ((uchar*)b) + msize(b);
b->rp = b->base;
n = b->lim - b->base - size;
b->rp += n & ~(BY2V-1);
b->wp = b->rp;
return b;
}
Block*
allocb(int size)
{
Block *b;
if(0 && up == nil)
panic("allocb outside process: %8.8lux", getcallerpc(&size));
b = _allocb(size);
if(b == 0)
exhausted("Blocks");
setmalloctag(b, getcallerpc(&size));
return b;
}
/*
* interrupt time allocation
*/
Block*
iallocb(int size)
{
Block *b;
if(ialloc.bytes > conf.ialloc){
//print("iallocb: limited %lud/%lud\n", ialloc.bytes, conf.ialloc);
return nil;
}
b = _allocb(size);
if(b == nil){
//print("iallocb: no memory %lud/%lud\n", ialloc.bytes, conf.ialloc);
return nil;
}
setmalloctag(b, getcallerpc(&size));
b->flag = BINTR;
ilock(&ialloc);
ialloc.bytes += b->lim - b->base;
iunlock(&ialloc);
return b;
}
void
freeb(Block *b)
{
void *dead = (void*)Bdead;
if(b == nil)
return;
/*
* drivers which perform non cache coherent DMA manage their own buffer
* pool of uncached buffers and provide their own free routine.
*/
if(b->free) {
b->free(b);
return;
}
if(b->flag & BINTR) {
ilock(&ialloc);
ialloc.bytes -= b->lim - b->base;
iunlock(&ialloc);
}
/* poison the block in case someone is still holding onto it */
b->next = dead;
b->rp = dead;
b->wp = dead;
b->lim = dead;
b->base = dead;
free(b);
}
void
checkb(Block *b, char *msg)
{
void *dead = (void*)Bdead;
if(b == dead)
panic("checkb b %s %lux", msg, b);
if(b->base == dead || b->lim == dead || b->next == dead
|| b->rp == dead || b->wp == dead){
print("checkb: base 0x%8.8luX lim 0x%8.8luX next 0x%8.8luX\n",
b->base, b->lim, b->next);
print("checkb: rp 0x%8.8luX wp 0x%8.8luX\n", b->rp, b->wp);
panic("checkb dead: %s\n", msg);
}
if(b->base > b->lim)
panic("checkb 0 %s %lux %lux", msg, b->base, b->lim);
if(b->rp < b->base)
panic("checkb 1 %s %lux %lux", msg, b->base, b->rp);
if(b->wp < b->base)
panic("checkb 2 %s %lux %lux", msg, b->base, b->wp);
if(b->rp > b->lim)
panic("checkb 3 %s %lux %lux", msg, b->rp, b->lim);
if(b->wp > b->lim)
panic("checkb 4 %s %lux %lux", msg, b->wp, b->lim);
}
void
iallocsummary(void)
{
print("ialloc %lud/%lud\n", ialloc.bytes, conf.ialloc);
}
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