[Qemu-devel] [PATCH v6 56/77] mips_malta: Setup GT64120 BARs in nanoMIPS bootloader

[Stefan Markovic <stefan.markovic@rt-rk.com>]

From: Paul Burton <pburton@wavecomp.com>

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 <pburton@wavecomp.com>
Signed-off-by: Yongbok Kim <yongbok.kim@mips.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Stefan Markovic <smarkovic@wavecomp.com>
Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
---
 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 4bc9036..d1a7c1f 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -664,6 +664,79 @@ 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