[Qemu-devel] [PATCH 31/35] mips_malta: Setup GT64120 BARs in nanoMIPS bootloader

[Yongbok Kim]

From: Paul Burton <address@hidden>

Setup the GT64120 BARs in the nanoMIPS bootloader, in the same way that
they are setup in the MIPS32 bootloader. This is necessary for Linux to
be able to access peripherals, including the UART.

Signed-off-by: Paul Burton <address@hidden>
Signed-off-by: Yongbok Kim <address@hidden>
---
 hw/mips/mips_malta.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index 39f4c5b..c4139d6 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -663,6 +663,79 @@ static void write_bootloader_nanomips(uint8_t *base, 
int64_t run_addr,
                                 /* lui a3,%hi(loaderparams.ram_low_size) */
     stw_p(p++, 0x80e7); stw_p(p++, NM_LO(loaderparams.ram_low_size));
                                 /* ori a3,a3,%lo(loaderparams.ram_low_size) */
+
+    /* Load BAR registers as done by YAMON */
+    stw_p(p++, 0xe040); stw_p(p++, 0x0681);
+                                /* lui t1, %hi(0xb4000000) */
+#ifdef TARGET_WORDS_BIGENDIAN
+    stw_p(p++, 0xe020); stw_p(p++, 0x0be1);
+                                /* lui t0, %hi(0xdf000000) */
+#else
+    stw_p(p++, 0x0020); stw_p(p++, 0x00df);
+                                /* addiu[32] t0, $0, 0xdf */
+#endif
+    stw_p(p++, 0x8422); stw_p(p++, 0x9068);
+                                /* sw t0, 0x68(t1) */
+
+    stw_p(p++, 0xe040); stw_p(p++, 0x077d);
+                                /* lui t1, %hi(0xbbe00000) */
+#ifdef TARGET_WORDS_BIGENDIAN
+    stw_p(p++, 0xe020); stw_p(p++, 0x0801);
+                                /* lui t0, %hi(0xc0000000) */
+#else
+    stw_p(p++, 0x0020); stw_p(p++, 0x00c0);
+                                /* addiu[32] t0, $0, 0xc0 */
+#endif
+    stw_p(p++, 0x8422); stw_p(p++, 0x9048);
+                                /* sw t0, 0x48(t1) */
+#ifdef TARGET_WORDS_BIGENDIAN
+    stw_p(p++, 0xe020); stw_p(p++, 0x0800);
+                                /* lui t0, %hi(0x40000000) */
+#else
+    stw_p(p++, 0x0020); stw_p(p++, 0x0040);
+                                /* addiu[32] t0, $0, 0x40 */
+#endif
+    stw_p(p++, 0x8422); stw_p(p++, 0x9050);
+                                /* sw t0, 0x50(t1) */
+
+#ifdef TARGET_WORDS_BIGENDIAN
+    stw_p(p++, 0xe020); stw_p(p++, 0x0001);
+                                /* lui t0, %hi(0x80000000) */
+#else
+    stw_p(p++, 0x0020); stw_p(p++, 0x0080);
+                                /* addiu[32] t0, $0, 0x80 */
+#endif
+    stw_p(p++, 0x8422); stw_p(p++, 0x9058);
+                                /* sw t0, 0x58(t1) */
+#ifdef TARGET_WORDS_BIGENDIAN
+    stw_p(p++, 0xe020); stw_p(p++, 0x07e0);
+                                /* lui t0, %hi(0x3f000000) */
+#else
+    stw_p(p++, 0x0020); stw_p(p++, 0x003f);
+                                /* addiu[32] t0, $0, 0x3f */
+#endif
+    stw_p(p++, 0x8422); stw_p(p++, 0x9060);
+                                /* sw t0, 0x60(t1) */
+
+#ifdef TARGET_WORDS_BIGENDIAN
+    stw_p(p++, 0xe020); stw_p(p++, 0x0821);
+                                /* lui t0, %hi(0xc1000000) */
+#else
+    stw_p(p++, 0x0020); stw_p(p++, 0x00c1);
+                                /* addiu[32] t0, $0, 0xc1 */
+#endif
+    stw_p(p++, 0x8422); stw_p(p++, 0x9080);
+                                /* sw t0, 0x80(t1) */
+#ifdef TARGET_WORDS_BIGENDIAN
+    stw_p(p++, 0xe020); stw_p(p++, 0x0bc0);
+                                /* lui t0, %hi(0x5e000000) */
+#else
+    stw_p(p++, 0x0020); stw_p(p++, 0x005e);
+                                /* addiu[32] t0, $0, 0x5e */
+#endif
+    stw_p(p++, 0x8422); stw_p(p++, 0x9088);
+                                /* sw t0, 0x88(t1) */
+
     stw_p(p++, 0xe320 | NM_HI1(kernel_entry));
     stw_p(p++, NM_HI2(kernel_entry));
                                 /* lui t9,%hi(kernel_entry) */
-- 
1.9.1