target/microblaze: Add use-non-secure property

This property is used to control the security of the following interfaces
on MicroBlaze:
M_AXI_DP - data interface
M_AXI_IP - instruction interface
M_AXI_DC - dcache interface
M_AXI_IC - icache interface

It works by enabling or disabling the use of the non_secure[3:0] signals.

Interfaces and their corresponding values are taken from:
https://www.xilinx.com/support/documentation/sw_manuals/xilinx2020_2/ug984-vivado-microblaze-ref.pdf
page 153.

Signed-off-by: Joe Komlodi <komlodi@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-Id: <1611274735-303873-2-git-send-email-komlodi@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

target/microblaze/cpu.c

@@ -98,6 +98,38 @@ static bool mb_cpu_has_work(CPUState *cs)
 }
 
 #ifndef CONFIG_USER_ONLY
+static void mb_cpu_ns_axi_dp(void *opaque, int irq, int level)
+{
+    MicroBlazeCPU *cpu = opaque;
+    bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_DP_MASK;
+
+    cpu->ns_axi_dp = level & en;
+}
+
+static void mb_cpu_ns_axi_ip(void *opaque, int irq, int level)
+{
+    MicroBlazeCPU *cpu = opaque;
+    bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_IP_MASK;
+
+    cpu->ns_axi_ip = level & en;
+}
+
+static void mb_cpu_ns_axi_dc(void *opaque, int irq, int level)
+{
+    MicroBlazeCPU *cpu = opaque;
+    bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_DC_MASK;
+
+    cpu->ns_axi_dc = level & en;
+}
+
+static void mb_cpu_ns_axi_ic(void *opaque, int irq, int level)
+{
+    MicroBlazeCPU *cpu = opaque;
+    bool en = cpu->cfg.use_non_secure & USE_NON_SECURE_M_AXI_IC_MASK;
+
+    cpu->ns_axi_ic = level & en;
+}
+
 static void microblaze_cpu_set_irq(void *opaque, int irq, int level)
 {
     MicroBlazeCPU *cpu = opaque;
@@ -248,6 +280,10 @@ static void mb_cpu_initfn(Object *obj)
 #ifndef CONFIG_USER_ONLY
     /* Inbound IRQ and FIR lines */
     qdev_init_gpio_in(DEVICE(cpu), microblaze_cpu_set_irq, 2);
+    qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dp, "ns_axi_dp", 1);
+    qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ip, "ns_axi_ip", 1);
+    qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_dc, "ns_axi_dc", 1);
+    qdev_init_gpio_in_named(DEVICE(cpu), mb_cpu_ns_axi_ic, "ns_axi_ic", 1);
 #endif
 }
 
@@ -277,6 +313,16 @@ static Property mb_properties[] = {
     DEFINE_PROP_BOOL("use-msr-instr", MicroBlazeCPU, cfg.use_msr_instr, true),
     DEFINE_PROP_BOOL("use-pcmp-instr", MicroBlazeCPU, cfg.use_pcmp_instr, true),
     DEFINE_PROP_BOOL("use-mmu", MicroBlazeCPU, cfg.use_mmu, true),
+    /*
+     * use-non-secure enables/disables the use of the non_secure[3:0] signals.
+     * It is a bitfield where 1 = non-secure for the following bits and their
+     * corresponding interfaces:
+     * 0x1 - M_AXI_DP
+     * 0x2 - M_AXI_IP
+     * 0x4 - M_AXI_DC
+     * 0x8 - M_AXI_IC
+     */
+    DEFINE_PROP_UINT8("use-non-secure", MicroBlazeCPU, cfg.use_non_secure, 0),
     DEFINE_PROP_BOOL("dcache-writeback", MicroBlazeCPU, cfg.dcache_writeback,
                      false),
     DEFINE_PROP_BOOL("endianness", MicroBlazeCPU, cfg.endi, false),

target/microblaze/cpu.h

@@ -233,6 +233,12 @@ typedef struct CPUMBState CPUMBState;
 
 #define TARGET_INSN_START_EXTRA_WORDS 1
 
+/* use-non-secure property masks */
+#define USE_NON_SECURE_M_AXI_DP_MASK 0x1
+#define USE_NON_SECURE_M_AXI_IP_MASK 0x2
+#define USE_NON_SECURE_M_AXI_DC_MASK 0x4
+#define USE_NON_SECURE_M_AXI_IC_MASK 0x8
+
 struct CPUMBState {
     uint32_t bvalue;   /* TCG temporary, only valid during a TB */
     uint32_t btarget;  /* Full resolved branch destination */
@@ -316,6 +322,7 @@ typedef struct {
     bool use_msr_instr;
     bool use_pcmp_instr;
     bool use_mmu;
+    uint8_t use_non_secure;
     bool dcache_writeback;
     bool endi;
     bool dopb_bus_exception;
@@ -337,6 +344,10 @@ struct MicroBlazeCPU {
     CPUState parent_obj;
 
     /*< public >*/
+    bool ns_axi_dp;
+    bool ns_axi_ip;
+    bool ns_axi_dc;
+    bool ns_axi_ic;
 
     CPUNegativeOffsetState neg;
     CPUMBState env;