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New MEM driver for recovery.

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This commit is contained in:
Jorrit Herder
2005-10-20 20:26:02 +00:00
parent 86e3333454
commit 381c24ce17
3 changed files with 52 additions and 24 deletions
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57
drivers/memory/memory.c
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@@ -205,12 +205,8 @@ PRIVATE int m_do_open(dp, m_ptr)
struct driver *dp;
message *m_ptr;
{
/* Check device number on open. (This used to give I/O privileges to a
* process opening /dev/mem or /dev/kmem. This may be needed in case of
* memory mapped I/O. With system calls to do I/O this is no longer needed.)
*/
/* Check device number on open. */
if (m_prepare(m_ptr->DEVICE) == NIL_DEV) return(ENXIO);
return(OK);
}
@@ -220,6 +216,9 @@ message *m_ptr;
PRIVATE void m_init()
{
/* Initialize this task. All minor devices are initialized one by one. */
phys_bytes ramdev_size;
phys_bytes ramdev_base;
message m;
int i, s;
if (OK != (s=sys_getkinfo(&kinfo))) {
@@ -244,6 +243,22 @@ PRIVATE void m_init()
}
}
/* See if there are already RAM disk details at the Data Store server. */
m.DS_KEY = MEMORY_MAJOR;
if (OK == (s = _taskcall(DS_PROC_NR, DS_RETRIEVE, &m))) {
ramdev_size = m.DS_VAL_L1;
ramdev_base = m.DS_VAL_L2;
printf("MEM retrieved size %u and base %u from DS, status %d\n",
ramdev_size, ramdev_base, s);
if (OK != (s=sys_segctl(&m_seg[RAM_DEV], (u16_t *) &s,
(vir_bytes *) &s, ramdev_base, ramdev_size))) {
panic("MEM","Couldn't install remote segment.",s);
}
m_geom[RAM_DEV].dv_base = cvul64(ramdev_base);
m_geom[RAM_DEV].dv_size = cvul64(ramdev_size);
printf("MEM stored retrieved details as new RAM disk\n");
}
/* Initialize /dev/zero. Simply write zeros into the buffer. */
for (i=0; i<ZERO_BUF_SIZE; i++) {
dev_zero[i] = '\0';
@@ -283,19 +298,19 @@ message *m_ptr; /* pointer to control message */
* - MIOCRAMSIZE: to set the size of the RAM disk.
*/
struct device *dv;
if ((dv = m_prepare(m_ptr->DEVICE)) == NIL_DEV) return(ENXIO);
switch (m_ptr->REQUEST) {
case MIOCRAMSIZE: {
/* FS wants to create a new RAM disk with the given size. */
phys_bytes ramdev_size;
phys_bytes ramdev_base;
message m;
int s;
if (m_ptr->PROC_NR != FS_PROC_NR) {
report("MEM", "warning, MIOCRAMSIZE called by", m_ptr->PROC_NR);
return(EPERM);
}
/* Only FS can create RAM disk, and only on RAM disk device. */
if (m_ptr->PROC_NR != FS_PROC_NR) return(EPERM);
if (m_ptr->DEVICE != RAM_DEV) return(EINVAL);
if ((dv = m_prepare(m_ptr->DEVICE)) == NIL_DEV) return(ENXIO);
/* Try to allocate a piece of memory for the RAM disk. */
ramdev_size = m_ptr->POSITION;
@@ -303,13 +318,26 @@ message *m_ptr; /* pointer to control message */
report("MEM", "warning, allocmem failed", errno);
return(ENOMEM);
}
dv->dv_base = cvul64(ramdev_base);
dv->dv_size = cvul64(ramdev_size);
if (OK != (s=sys_segctl(&m_seg[RAM_DEV], (u16_t *) &s, (vir_bytes *) &s,
ramdev_base, ramdev_size))) {
/* Store the values we got in the data store so we can retrieve
* them later on, in the unfortunate event of a crash.
*/
m.DS_KEY = MEMORY_MAJOR;
m.DS_VAL_L1 = ramdev_size;
m.DS_VAL_L2 = ramdev_base;
if (OK != (s = _taskcall(DS_PROC_NR, DS_PUBLISH, &m))) {
panic("MEM","Couldn't store RAM disk details at DS.",s);
}
printf("MEM stored size %u and base %u at DS, status %d\n",
ramdev_size, ramdev_base, s);
if (OK != (s=sys_segctl(&m_seg[RAM_DEV], (u16_t *) &s,
(vir_bytes *) &s, ramdev_base, ramdev_size))) {
panic("MEM","Couldn't install remote segment.",s);
}
dv->dv_base = cvul64(ramdev_base);
dv->dv_size = cvul64(ramdev_size);
break;
}
case MIOCMAP:
@@ -329,7 +357,6 @@ message *m_ptr; /* pointer to control message */
return r;
r= sys_vm_map(m_ptr->PROC_NR, do_map,
(phys_bytes)mapreq.base, mapreq.size, mapreq.offset);
printf("m_ioctl MIOC(UN)MAP: result %d\n", r);
return r;
}