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authorPeter Maydell <peter.maydell@linaro.org>2018-06-22 13:28:40 +0100
committerPeter Maydell <peter.maydell@linaro.org>2018-06-22 13:28:40 +0100
commit57c49a6e8773bcce0d407ff4d9b2de7a904f1b0d (patch)
treed7801f558b739d8af65e8049c565237c165c76e3 /hw/misc/tz-mpc.c
parentcdb6099818a78e80b307432f6f9c143452135c59 (diff)
hw/misc/tz-mpc.c: Implement correct blocked-access behaviour
The MPC is guest-configurable for whether blocked accesses: * should be RAZ/WI or cause a bus error * should generate an interrupt or not Implement this behaviour in the blocked-access handlers. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Message-id: 20180620132032.28865-4-peter.maydell@linaro.org
Diffstat (limited to 'hw/misc/tz-mpc.c')
-rw-r--r--hw/misc/tz-mpc.c50
1 files changed, 48 insertions, 2 deletions
diff --git a/hw/misc/tz-mpc.c b/hw/misc/tz-mpc.c
index e5b91bf81a..fded5922a2 100644
--- a/hw/misc/tz-mpc.c
+++ b/hw/misc/tz-mpc.c
@@ -43,6 +43,9 @@ REG32(INT_EN, 0x28)
FIELD(INT_EN, IRQ, 0, 1)
REG32(INT_INFO1, 0x2c)
REG32(INT_INFO2, 0x30)
+ FIELD(INT_INFO2, HMASTER, 0, 16)
+ FIELD(INT_INFO2, HNONSEC, 16, 1)
+ FIELD(INT_INFO2, CFG_NS, 17, 1)
REG32(INT_SET, 0x34)
FIELD(INT_SET, IRQ, 0, 1)
REG32(PIDR4, 0xfd0)
@@ -287,6 +290,45 @@ static const MemoryRegionOps tz_mpc_reg_ops = {
.impl.max_access_size = 4,
};
+static inline bool tz_mpc_cfg_ns(TZMPC *s, hwaddr addr)
+{
+ /* Return the cfg_ns bit from the LUT for the specified address */
+ hwaddr blknum = addr / s->blocksize;
+ hwaddr blkword = blknum / 32;
+ uint32_t blkbit = 1U << (blknum % 32);
+
+ /* This would imply the address was larger than the size we
+ * defined this memory region to be, so it can't happen.
+ */
+ assert(blkword < s->blk_max);
+ return s->blk_lut[blkword] & blkbit;
+}
+
+static MemTxResult tz_mpc_handle_block(TZMPC *s, hwaddr addr, MemTxAttrs attrs)
+{
+ /* Handle a blocked transaction: raise IRQ, capture info, etc */
+ if (!s->int_stat) {
+ /* First blocked transfer: capture information into INT_INFO1 and
+ * INT_INFO2. Subsequent transfers are still blocked but don't
+ * capture information until the guest clears the interrupt.
+ */
+
+ s->int_info1 = addr;
+ s->int_info2 = 0;
+ s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, HMASTER,
+ attrs.requester_id & 0xffff);
+ s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, HNONSEC,
+ ~attrs.secure);
+ s->int_info2 = FIELD_DP32(s->int_info2, INT_INFO2, CFG_NS,
+ tz_mpc_cfg_ns(s, addr));
+ s->int_stat |= R_INT_STAT_IRQ_MASK;
+ tz_mpc_irq_update(s);
+ }
+
+ /* Generate bus error if desired; otherwise RAZ/WI */
+ return (s->ctrl & R_CTRL_SEC_RESP_MASK) ? MEMTX_ERROR : MEMTX_OK;
+}
+
/* Accesses only reach these read and write functions if the MPC is
* blocking them; non-blocked accesses go directly to the downstream
* memory region without passing through this code.
@@ -295,19 +337,23 @@ static MemTxResult tz_mpc_mem_blocked_read(void *opaque, hwaddr addr,
uint64_t *pdata,
unsigned size, MemTxAttrs attrs)
{
+ TZMPC *s = TZ_MPC(opaque);
+
trace_tz_mpc_mem_blocked_read(addr, size, attrs.secure);
*pdata = 0;
- return MEMTX_OK;
+ return tz_mpc_handle_block(s, addr, attrs);
}
static MemTxResult tz_mpc_mem_blocked_write(void *opaque, hwaddr addr,
uint64_t value,
unsigned size, MemTxAttrs attrs)
{
+ TZMPC *s = TZ_MPC(opaque);
+
trace_tz_mpc_mem_blocked_write(addr, value, size, attrs.secure);
- return MEMTX_OK;
+ return tz_mpc_handle_block(s, addr, attrs);
}
static const MemoryRegionOps tz_mpc_mem_blocked_ops = {