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nu/nusec.c: Implement log ring buffer

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This commit is contained in:
Tau 2018-11-14 10:48:42 -05:00
parent c825959250
commit 78e7de613f
1 changed files with 84 additions and 21 deletions
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103
nu/nusec.c
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@ -25,6 +25,10 @@ enum {
NUSEC_IOCTL_PUT_TRACE_LOG_DATA = 0x22E190,
};
struct nusec_log_record {
uint8_t unknown[60];
};
static HRESULT nusec_handle_irp(struct irp *irp);
static HRESULT nusec_handle_open(struct irp *irp);
static HRESULT nusec_handle_close(struct irp *irp);
@ -50,12 +54,15 @@ static HANDLE nusec_fd;
static uint32_t nusec_nearfull;
static uint32_t nusec_play_count;
static uint32_t nusec_play_limit;
static struct nusec_log_record nusec_log[7154];
static size_t nusec_log_head;
static size_t nusec_log_tail;
void nusec_hook_init(void)
{
nusec_nearfull = 0x00010200;
nusec_play_count = 0;
nusec_play_limit = 1000;
nusec_play_limit = 1024;
nusec_fd = iohook_open_dummy_fd();
iohook_push_handler(nusec_handle_irp);
}
@ -162,16 +169,25 @@ static HRESULT nusec_ioctl_ping(struct irp *irp)
static HRESULT nusec_ioctl_erase_trace_log(struct irp *irp)
{
uint32_t cell;
uint32_t count;
size_t avail;
HRESULT hr;
hr = iobuf_read_le32(&irp->write, &cell);
hr = iobuf_read_le32(&irp->write, &count);
if (FAILED(hr)) {
return hr;
}
dprintf("Security: %s(cell=%i)\n", __func__, cell);
dprintf("Security: %s(count=%i)\n", __func__, count);
avail = nusec_log_head - nusec_log_tail;
if (count < avail) {
count = avail;
}
nusec_log_tail += count;
return S_OK;
}
@ -286,9 +302,17 @@ static HRESULT nusec_ioctl_get_nearfull(struct irp *irp)
static HRESULT nusec_ioctl_get_nvram_available(struct irp *irp)
{
dprintf("Security: %s\n", __func__);
size_t used;
size_t avail;
return iobuf_write_le32(&irp->read, 1024);
used = nusec_log_head - nusec_log_tail;
avail = _countof(nusec_log) - used;
dprintf("Security: %s: used=%i avail=%i\n", __func__,
(int) used,
(int) avail);
return iobuf_write_le32(&irp->read, avail);
}
static HRESULT nusec_ioctl_get_nvram_geometry(struct irp *irp)
@ -297,8 +321,8 @@ static HRESULT nusec_ioctl_get_nvram_geometry(struct irp *irp)
dprintf("Security: %s\n", __func__);
iobuf_write_le32(&irp->read, 10);
hr = iobuf_write_le32(&irp->read, 4096);
iobuf_write_le32(&irp->read, 10); /* Num NVRAMs */
hr = iobuf_write_le32(&irp->read, 4096); /* Num addresses (per NVRAM?) */
return hr;
}
@ -319,44 +343,63 @@ static HRESULT nusec_ioctl_get_play_limit(struct irp *irp)
static HRESULT nusec_ioctl_get_trace_log_data(struct irp *irp)
{
uint32_t param0;
uint32_t param1;
uint32_t pos;
uint32_t count;
size_t avail;
HRESULT hr;
dprintf("Security: %s\n", __func__);
hr = iobuf_read_le32(&irp->write, &param0);
hr = iobuf_read_le32(&irp->write, &pos);
if (FAILED(hr)) {
return hr;
}
hr = iobuf_read_le32(&irp->write, &param1);
hr = iobuf_read_le32(&irp->write, &count);
if (FAILED(hr)) {
return hr;
}
dprintf("\tPARAM %i %i\n", param0, param1);
dprintf(" Params: %i %i Buf: %i\n", pos, count, irp->read.nbytes);
return E_FAIL;
avail = irp->read.nbytes - irp->read.pos;
if (avail < count * sizeof(struct nusec_log_record)) {
dprintf("\tError: Insufficient buffer\n");
return HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER);
}
while (count > 0 && pos != nusec_log_head) {
memcpy( &irp->read.bytes[irp->read.pos],
&nusec_log[pos % _countof(nusec_log)],
sizeof(struct nusec_log_record));
irp->read.pos += sizeof(struct nusec_log_record);
pos++;
count--;
}
return S_OK;
}
static HRESULT nusec_ioctl_get_trace_log_state(struct irp *irp)
{
HRESULT hr;
dprintf("Security: %s\n", __func__);
dprintf("Security: %s H: %i T: %i\n",
__func__,
(int) nusec_log_head,
(int) nusec_log_tail);
hr = iobuf_write_le32(&irp->read, 0);
iobuf_write_le32(&irp->read, nusec_log_head - nusec_log_tail);
hr = iobuf_write_le32(&irp->read, nusec_log_tail);
if (FAILED(hr)) {
return hr;
}
return iobuf_write_le32(&irp->read, 0);
}
static HRESULT nusec_ioctl_put_nearfull(struct irp *irp)
{
dprintf("Security: %s\n", __func__);
@ -378,5 +421,25 @@ static HRESULT nusec_ioctl_put_trace_log_data(struct irp *irp)
dprintf("Security: %s\n", __func__);
dump_const_iobuf(&irp->write);
if (irp->write.nbytes != sizeof(struct nusec_log_record)) {
dprintf(" Log record size is incorrect\n");
return E_INVALIDARG;
}
if (nusec_log_head - nusec_log_tail >= _countof(nusec_log)) {
dprintf(" Log buffer is full!\n");
return HRESULT_FROM_WIN32(ERROR_DISK_FULL);
}
memcpy( &nusec_log[nusec_log_head % _countof(nusec_log)],
irp->write.bytes,
sizeof(struct nusec_log_record));
nusec_log_head++;
dprintf(" H: %i T: %i\n", (int) nusec_log_head, (int) nusec_log_tail);
return S_OK;
}