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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
typedef struct IOMap IOMap;
struct IOMap
{
IOMap *next;
ulong start;
ulong end;
char reserved;
char tag[13];
};
static struct
{
Lock;
IOMap *m;
IOMap *free;
IOMap maps[32]; /* some initial free maps */
ulong mask;
} iomap;
static void
insert(IOMap **l, ulong start, ulong end, char *tag, int reserved)
{
IOMap *m;
m = iomap.free;
if(m != nil)
iomap.free = m->next;
else
m = malloc(sizeof(IOMap));
if(m == nil)
panic("ioalloc: out of memory");
m->next = *l;
m->start = start;
m->end = end;
m->reserved = reserved;
strncpy(m->tag, tag, sizeof(m->tag)-1);
m->tag[sizeof(m->tag)-1] = 0;
*l = m;
}
/*
* Reserve a range to be ioalloced later.
* If port is -1, look for a free range above 0x400.
*/
int
ioreserve(ulong port, ulong size, ulong align, char *tag)
{
if(port == -1)
return ioreservewin(0x400, -0x400 & iomap.mask, size, align, tag);
else
return ioreservewin(port, size, size, align, tag);
}
/*
* Find a free region of length "size" within the window [port, port+win)
* and reserve it to be ioalloced later.
*/
int
ioreservewin(ulong port, ulong win, ulong size, ulong align, char *tag)
{
IOMap *m, **l;
if(win == 0 || port & ~iomap.mask || (~port & iomap.mask) < (win-1 & iomap.mask))
return -1;
size = (size + ~iomap.mask) & iomap.mask;
if(size == 0 || size > win)
return -1;
if(align){
if((align & (align-1)) != 0)
return -1;
align--;
}
win += port;
port = (port+align) & ~align;
if(port >= win || win - port < size)
return -1;
lock(&iomap);
for(l = &iomap.m; (m = *l) != nil; l = &m->next){
if(m->end <= port)
continue;
if(m->start > port && m->start - port >= size)
break;
port = m->end;
port = (port+align) & ~align;
if(port >= win || win - port < size){
unlock(&iomap);
return -1;
}
}
insert(l, port, port + size, tag, 1);
unlock(&iomap);
return port;
}
/*
* Alloc some io port space and remember who it was
* alloced to. If port == -1, find a free region.
*/
int
ioalloc(ulong port, ulong size, ulong align, char *tag)
{
IOMap *m, **l;
if(port == -1)
port = ioreserve(port, size, align, tag);
size = (size + ~iomap.mask) & iomap.mask;
if(size == 0 || port & ~iomap.mask || (~port & iomap.mask) < (size-1 & iomap.mask))
return -1;
lock(&iomap);
for(l = &iomap.m; (m = *l) != nil; l = &m->next){
if(m->end <= port)
continue;
if(m->start > port && m->start - port >= size)
break;
if(m->reserved && m->start <= port && m->end - port >= size){
if(m->end - port > size)
insert(&m->next, port + size, m->end, m->tag, 1);
if(m->start < port){
insert(l, m->start, port, m->tag, 1);
l = &(*l)->next;
}
*l = m->next;
m->next = iomap.free;
iomap.free = m;
break;
}
print("ioalloc: %lux - %lux %s: clashes with: %lux - %lux %s\n",
port, port+size-1, tag,
m->start, m->end-1, m->tag);
unlock(&iomap);
return -1;
}
insert(l, port, port + size, tag, 0);
unlock(&iomap);
return port;
}
void
iofree(ulong port)
{
IOMap *m, **l;
if(port & ~iomap.mask)
return;
lock(&iomap);
for(l = &iomap.m; (m = *l) != nil; l = &m->next){
if(m->start == port){
*l = m->next;
m->next = iomap.free;
iomap.free = m;
break;
}
if(m->start > port)
break;
}
unlock(&iomap);
}
int
iounused(ulong start, ulong end)
{
IOMap *m;
if(start & ~iomap.mask || end < start)
return 0;
for(m = iomap.m; m != nil; m = m->next){
if(m->end <= start)
continue;
if(m->start >= end)
break;
if(!m->reserved)
return 0;
}
return 1;
}
static long
iomapread(Chan*, void *a, long n, vlong offset)
{
char buf[32];
IOMap *m;
int i;
lock(&iomap);
i = 0;
for(m = iomap.m; m != nil; m = m->next){
i = snprint(buf, sizeof(buf), "%8lux %8lux %-12.12s\n",
m->start, m->end-1, m->tag);
offset -= i;
if(offset < 0)
break;
}
unlock(&iomap);
if(offset >= 0)
return 0;
if(n > -offset)
n = -offset;
offset += i;
memmove(a, buf+offset, n);
return n;
}
/*
* Initialize the io space port map.
* The mask argument defines the valid bits of
* a port address, so different architectures
* might have different sizes and alignments.
*/
void
iomapinit(ulong mask)
{
int i;
assert(mask != 0 && (mask >> 31) == 0);
for(i = 0; i < nelem(iomap.maps)-1; i++)
iomap.maps[i].next = &iomap.maps[i+1];
iomap.maps[i].next = nil;
iomap.free = iomap.maps;
iomap.mask = mask;
addarchfile("ioalloc", 0444, iomapread, nil);
}
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