diff options
Diffstat (limited to 'big-little/virtualisor/mem_trap.c')
| -rw-r--r-- | big-little/virtualisor/mem_trap.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/big-little/virtualisor/mem_trap.c b/big-little/virtualisor/mem_trap.c new file mode 100644 index 0000000..bd99b52 --- /dev/null +++ b/big-little/virtualisor/mem_trap.c @@ -0,0 +1,126 @@ +/* + * $Copyright: + * ---------------------------------------------------------------- + * This confidential and proprietary software may be used only as + * authorised by a licensing agreement from ARM Limited + * (C) COPYRIGHT 2008-2011 ARM Limited + * ALL RIGHTS RESERVED + * The entire notice above must be reproduced on all authorised + * copies and copies may only be made to the extent permitted + * by a licensing agreement from ARM Limited. + * ---------------------------------------------------------------- + * File: mem_trap.c + * ---------------------------------------------------------------- + * $ + */ + +#include "virtualisor.h" +#include "misc.h" +#include "virt_helpers.h" +#include "mem_trap.h" + +/* + * Generic call to make accesses to a peripheral trap into the + * HYP mode by invalidating its descriptor in the 2nd stage + * translation tables + */ +unsigned mem_trap_setup(unsigned periph_addr, mem_trap_data *periph_trap_data) +{ + unsigned rc = 0x0, four_kb_index = 0; + unsigned one_gb_index = 0, two_mb_index = 0; + unsigned long long vtcr = 0x0, hcr = 0x0, level = 0; + unsigned long long pagetable_base = 0x0, l2_desc = 0; + unsigned long long l3_desc = 0, l3_table = 0; + + /* Check if 2nd stage translations are enabled */ + hcr = read_hcr(); + if (!(hcr & HCR_VM)) { + printf("%s: 2nd Stage translations not enabled \n", __FUNCTION__); + rc = 0x1; + goto out; + } + + /* Check what level of tables we need to start at */ + vtcr = read_vtcr(); + level = (vtcr >> 6) & 0x3; + + /* Read the page table base address. */ + pagetable_base = read_vttbr(); + + /* Calculate the table indices */ + one_gb_index = periph_addr >> 30; + + /* Each GB contains (1 << 9) or 512 2MBs */ + two_mb_index = (periph_addr >> 21) - ((1 << 9) * one_gb_index); + + /* Each GB contains (1 << 18) or 262144 4KBs */ + four_kb_index = (periph_addr >> 12) - ((1 << 9) * (periph_addr >> 21)); + + /* For either starting level find out the level 2 desc */ + switch (level) { + + case 0x1: + { + /* Start from first level */ + unsigned long long l1_desc = 0; + unsigned long long l2_table = 0; + + l1_desc = ((unsigned long long *)((unsigned)(&pagetable_base)[0]))[one_gb_index]; + if ((l1_desc & 0x3) != TABLE_MAPPING) { + printf("%s: Invalid 1st level desc : 0x%llu \n", __FUNCTION__, l1_desc); + rc = 0x1; + goto out; + } + + l2_table = l1_desc & 0xfffffff000UL; + l2_desc = ((unsigned long long *)((unsigned)(&l2_table)[0]))[two_mb_index]; + break; + } + + case 0x0: + { + /* Start from second level */ + l2_desc = ((unsigned long long *)((unsigned)(&pagetable_base)[0]))[two_mb_index]; + break; + } + + default: + printf("%s: Invalid Pagetable level \n", __FUNCTION__); + rc = 0x1; + } + + /* Validate the 2nd level descriptor */ + if ((l2_desc & 0x3) != TABLE_MAPPING) { + printf("%s: Invalid 2nd level desc : 0x%llu \n", + __FUNCTION__, l2_desc); + rc = 0x1; + goto out; + } + + l3_table = l2_desc & 0xfffffff000UL; + l3_desc = ((unsigned long long *)((unsigned)(&l3_table)[0]))[four_kb_index]; + + /* + * Validate the 3rd level descriptor. This means that the mapping is + * already invalid and we have not touched it + */ + if ((l3_desc & 0x3) != VALID_MAPPING) { + printf("%s: Invalid 3rd level desc : 0x%llu \n", + __FUNCTION__, l3_desc); + rc = 0x1; + goto out; + } + + /* Save the info gathered so far */ + periph_trap_data->table = l3_table; + periph_trap_data->index = four_kb_index; + periph_trap_data->prev_desc = l3_desc; + periph_trap_data->cluster_id = read_clusterid(); + periph_trap_data->valid = 1; + + /* Invalidate the peripheral page table entry */ + ((unsigned long long *)((unsigned)(&l3_table)[0]))[four_kb_index] = 0x0; + + out: + return rc; +} |