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Save and restore VGA display memory between suspend and resume.

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This commit is contained in:
jkim 2012-04-04 22:02:54 +00:00
parent 866c0e9fc2
commit 10109cda1b
1 changed files with 29 additions and 14 deletions
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43
sys/dev/fb/vesa.c
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@ -1465,22 +1465,30 @@ vesa_save_state(video_adapter_t *adp, void *p, size_t size)
vm_offset_t buf;
size_t bsize;
if (adp != vesa_adp || vesa_state_buf_size == 0)
if (adp != vesa_adp || (size == 0 && vesa_state_buf_size == 0))
return ((*prevvidsw->save_state)(adp, p, size));
bsize = offsetof(adp_state_t, regs) + vesa_state_buf_size;
if (size == 0)
return (offsetof(adp_state_t, regs) + vesa_state_buf_size);
if (size < (offsetof(adp_state_t, regs) + vesa_state_buf_size))
return (bsize);
if (vesa_state_buf_size > 0 && size < bsize)
return (EINVAL);
buf = adp->va_buffer;
if (buf != 0) {
if (VESA_MODE(adp->va_mode) && adp->va_buffer != 0) {
buf = adp->va_buffer;
bsize = adp->va_buffer_size;
} else {
buf = adp->va_window;
bsize = adp->va_window_size;
}
if (buf != 0) {
vesa_vmem_buf = malloc(bsize, M_DEVBUF, M_NOWAIT);
if (vesa_vmem_buf != NULL)
bcopy((void *)buf, vesa_vmem_buf, bsize);
} else
vesa_vmem_buf = NULL;
if (vesa_state_buf_size == 0)
return ((*prevvidsw->save_state)(adp, p, size));
((adp_state_t *)p)->sig = V_STATE_SIG;
return (vesa_bios_save_restore(STATE_SAVE, ((adp_state_t *)p)->regs));
}
@ -1490,27 +1498,34 @@ vesa_load_state(video_adapter_t *adp, void *p)
{
vm_offset_t buf;
size_t bsize;
int mode;
int error, mode;
if (adp != vesa_adp)
return ((*prevvidsw->load_state)(adp, p));
/* Try BIOS POST to restore a sane state. */
(void)vesa_bios_post();
bsize = adp->va_buffer_size;
mode = adp->va_mode;
(void)vesa_set_mode(adp, adp->va_initial_mode);
error = vesa_set_mode(adp, adp->va_initial_mode);
if (mode != adp->va_initial_mode)
(void)vesa_set_mode(adp, mode);
error = vesa_set_mode(adp, mode);
if (((adp_state_t *)p)->sig != V_STATE_SIG)
return ((*prevvidsw->load_state)(adp, p));
if (vesa_vmem_buf != NULL) {
buf = adp->va_buffer;
if (buf != 0)
bcopy(vesa_vmem_buf, (void *)buf, bsize);
if (error == 0) {
if (VESA_MODE(mode) && adp->va_buffer != 0) {
buf = adp->va_buffer;
bsize = adp->va_buffer_size;
} else {
buf = adp->va_window;
bsize = adp->va_window_size;
}
if (buf != 0)
bcopy(vesa_vmem_buf, (void *)buf, bsize);
}
free(vesa_vmem_buf, M_DEVBUF);
}
if (((adp_state_t *)p)->sig != V_STATE_SIG)
return ((*prevvidsw->load_state)(adp, p));
return (vesa_bios_save_restore(STATE_LOAD, ((adp_state_t *)p)->regs));
}