/*
* sfi_map_table()
*
* Return address of mapped table
* Check for common case that we can re-use mapping to SYST,
* which requires syst_pa, syst_va to be initialized.
*/
struct sfi_table_header *sfi_map_table(u64 pa)
{
struct sfi_table_header *th;
u32 length;
pr_emerg("Entering sfi_map_table, pa = %llx\n", pa);
if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
th = sfi_map_memory(pa, sizeof(struct sfi_table_header));
else
th = (void *)syst_va + (pa - syst_pa);
pr_emerg("sfi_map_table, th = %llx\n", (u64)th);
/* If table fits on same page as its header, we are done */
if (TABLE_ON_PAGE(th, th, th->len))
return th;
/* Entire table does not fit on same page as SYST */
length = th->len;
if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
sfi_unmap_memory(th, sizeof(struct sfi_table_header));
return sfi_map_memory(pa, length);
}
struct sfi_table_header *sfi_map_table(u64 pa)
{
struct sfi_table_header *th;
u32 length;
if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
th = sfi_map_memory(pa, sizeof(struct sfi_table_header));
else
th = (void *)syst_va + (pa - syst_pa);
if (TABLE_ON_PAGE(th, th, th->len))
return th;
length = th->len;
if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header)))
sfi_unmap_memory(th, sizeof(struct sfi_table_header));
return sfi_map_memory(pa, length);
}
/*
* sfi_unmap_table()
*
* Undoes effect of sfi_map_table() by unmapping table
* if it did not completely fit on same page as SYST.
*/
static void sfi_unmap_table(struct sfi_table_header *th)
{
if (!TABLE_ON_PAGE(syst_va, th, th->len))
sfi_unmap_memory(th, TABLE_ON_PAGE(th, th, th->len) ?
sizeof(*th) : th->len);
}
