Distinguish between debug reports for unimplemented vs invalid calls.

Don't use "fail" in the debug output - as this confuses users.
When reporting on an invalid parameter - use the word "invalid".
When reporting on an unimplemented call - state it is unimplemented.
Add separate debug levels for unimplemented vs invalid calls.
Also, increase the debug level of several entry points.

13 files changed, 148 insertions, 82 deletions

diff --git a/src/apm.c b/src/apm.c
index 2ca2c64..86d5051 100644
--- a/src/apm.c
+++ b/src/apm.c
@@ -155,7 +155,7 @@ handle_15530a(struct bregs *regs)
 static void
 handle_15530b(struct bregs *regs)
 {
-    set_code_fail_silent(regs, RET_ENOEVENT);
+    set_code_invalid_silent(regs, RET_ENOEVENT);
 }
 
 // APM Driver Version
@@ -186,14 +186,14 @@ handle_155310(struct bregs *regs)
 static void
 handle_1553XX(struct bregs *regs)
 {
-    set_fail(regs);
+    set_unimplemented(regs);
 }
 
 void VISIBLE16
 handle_1553(struct bregs *regs)
 {
     if (! CONFIG_APMBIOS) {
-        set_code_fail(regs, RET_EUNSUPPORTED);
+        set_code_invalid(regs, RET_EUNSUPPORTED);
         return;
     }
 
diff --git a/src/bregs.h b/src/bregs.h
index 3042ab2..0cdd016 100644
--- a/src/bregs.h
+++ b/src/bregs.h
@@ -79,26 +79,40 @@ set_code_success(struct bregs *regs)
 }
 
 static inline void
-set_fail_silent(struct bregs *regs)
+set_invalid_silent(struct bregs *regs)
 {
     set_cf(regs, 1);
 }
 
 static inline void
-set_code_fail_silent(struct bregs *regs, u8 code)
+set_code_invalid_silent(struct bregs *regs, u8 code)
 {
     regs->ah = code;
     set_cf(regs, 1);
 }
 
-#define set_fail(regs)                          \
-    __set_fail((regs), __LINE__, __func__)
-#define set_code_fail(regs, code)                               \
-    __set_code_fail((regs), (code) | (__LINE__ << 8), __func__)
+#define warn_invalid(regs)                      \
+    __warn_invalid((regs), __LINE__, __func__)
+#define set_invalid(regs)                       \
+    __set_invalid((regs), __LINE__, __func__)
+#define set_code_invalid(regs, code)                                    \
+    __set_code_invalid((regs), (code) | (__LINE__ << 8), __func__)
+
+#define warn_unimplemented(regs)                        \
+    __warn_unimplemented((regs), __LINE__, __func__)
+#define set_unimplemented(regs)                         \
+    __set_unimplemented((regs), __LINE__, __func__)
+#define set_code_unimplemented(regs, code)                              \
+    __set_code_unimplemented((regs), (code) | (__LINE__ << 8), __func__)
 
 // output.c
-void __set_fail(struct bregs *regs, int lineno, const char *fname);
-void __set_code_fail(struct bregs *regs, u32 linecode, const char *fname);
+void __warn_invalid(struct bregs *regs, int lineno, const char *fname);
+void __warn_unimplemented(struct bregs *regs, int lineno, const char *fname);
+void __set_invalid(struct bregs *regs, int lineno, const char *fname);
+void __set_unimplemented(struct bregs *regs, int lineno, const char *fname);
+void __set_code_invalid(struct bregs *regs, u32 linecode, const char *fname);
+void __set_code_unimplemented(struct bregs *regs, u32 linecode
+                              , const char *fname);
 
 #endif // !__ASSEMBLY__
 
diff --git a/src/clock.c b/src/clock.c
index 6706e5c..6b4acb9 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -253,7 +253,7 @@ static void
 handle_1a02(struct bregs *regs)
 {
     if (rtc_updating()) {
-        set_fail(regs);
+        set_invalid(regs);
         return;
     }
 
@@ -302,7 +302,7 @@ handle_1a04(struct bregs *regs)
 {
     regs->ah = 0;
     if (rtc_updating()) {
-        set_fail(regs);
+        set_invalid(regs);
         return;
     }
     regs->cl = inb_cmos(CMOS_RTC_YEAR);
@@ -336,7 +336,7 @@ handle_1a05(struct bregs *regs)
     // My assumption: RegB = (RegB & 01111111b)
     if (rtc_updating()) {
         init_rtc();
-        set_fail(regs);
+        set_invalid(regs);
         return;
     }
     outb_cmos(regs->cl, CMOS_RTC_YEAR);
@@ -370,7 +370,7 @@ handle_1a06(struct bregs *regs)
     regs->ax = 0;
     if (val8 & RTC_B_AIE) {
         // Alarm interrupt enabled already
-        set_fail(regs);
+        set_invalid(regs);
         return;
     }
     if (rtc_updating()) {
@@ -411,7 +411,7 @@ handle_1a07(struct bregs *regs)
 static void
 handle_1aXX(struct bregs *regs)
 {
-    set_fail(regs);
+    set_unimplemented(regs);
 }
 
 // INT 1Ah Time-of-day Service Entry Point
@@ -527,7 +527,7 @@ handle_1586(struct bregs *regs)
     u32 count = (regs->cx << 16) | regs->dx;
     int ret = set_usertimer(count, GET_SEG(SS), (u32)&statusflag);
     if (ret) {
-        set_code_fail(regs, RET_ECLOCKINUSE);
+        set_code_invalid(regs, RET_ECLOCKINUSE);
         return;
     }
     while (!statusflag)
@@ -542,7 +542,7 @@ handle_158300(struct bregs *regs)
     int ret = set_usertimer((regs->cx << 16) | regs->dx, regs->es, regs->bx);
     if (ret)
         // Interval already set.
-        set_code_fail(regs, RET_EUNSUPPORTED);
+        set_code_invalid(regs, RET_EUNSUPPORTED);
     else
         set_success(regs);
 }
@@ -558,7 +558,7 @@ handle_158301(struct bregs *regs)
 static void
 handle_1583XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EUNSUPPORTED);
+    set_code_unimplemented(regs, RET_EUNSUPPORTED);
     regs->al--;
 }
 
diff --git a/src/config.h b/src/config.h
index 3881cc4..91e322d 100644
--- a/src/config.h
+++ b/src/config.h
@@ -172,13 +172,13 @@
 #define DEBUG_ISR_09 9
 #define DEBUG_ISR_0e 9
 #define DEBUG_HDL_10 20
-#define DEBUG_HDL_11 1
-#define DEBUG_HDL_12 1
+#define DEBUG_HDL_11 2
+#define DEBUG_HDL_12 2
 #define DEBUG_HDL_13 10
-#define DEBUG_HDL_14 1
+#define DEBUG_HDL_14 2
 #define DEBUG_HDL_15 9
 #define DEBUG_HDL_16 9
-#define DEBUG_HDL_17 1
+#define DEBUG_HDL_17 2
 #define DEBUG_HDL_18 1
 #define DEBUG_HDL_19 1
 #define DEBUG_HDL_1a 9
@@ -191,6 +191,9 @@
 #define DEBUG_ISR_hwpic2 5
 #define DEBUG_HDL_pnp 1
 #define DEBUG_HDL_pmm 1
+
+#define DEBUG_unimplemented 2
+#define DEBUG_invalid 3
 #define DEBUG_thread 2
 
 #endif // config.h
diff --git a/src/disk.c b/src/disk.c
index ef4866f..4b09d71 100644
--- a/src/disk.c
+++ b/src/disk.c
@@ -28,15 +28,26 @@ __disk_ret(struct bregs *regs, u32 linecode, const char *fname)
     else
         SET_BDA(disk_last_status, code);
     if (code)
-        __set_code_fail(regs, linecode, fname);
+        __set_code_invalid(regs, linecode, fname);
     else
         set_code_success(regs);
 }
 
+void
+__disk_ret_unimplemented(struct bregs *regs, u32 linecode, const char *fname)
+{
+    u8 code = linecode;
+    if (regs->dl < EXTSTART_HD)
+        SET_BDA(floppy_last_status, code);
+    else
+        SET_BDA(disk_last_status, code);
+    __set_code_unimplemented(regs, linecode, fname);
+}
+
 static void
 __disk_stub(struct bregs *regs, int lineno, const char *fname)
 {
-    __debug_stub(regs, lineno, fname);
+    __warn_unimplemented(regs, lineno, fname);
     __disk_ret(regs, DISK_RET_SUCCESS | (lineno << 8), fname);
 }
 
@@ -426,7 +437,7 @@ disk_134502(struct bregs *regs, struct drive_s *drive_g)
 static void
 disk_1345XX(struct bregs *regs, struct drive_s *drive_g)
 {
-    disk_ret(regs, DISK_RET_EPARAM);
+    disk_ret_unimplemented(regs, DISK_RET_EPARAM);
 }
 
 // IBM/MS lock/unlock drive
@@ -648,7 +659,7 @@ disk_1349(struct bregs *regs, struct drive_s *drive_g)
         disk_ret(regs, DISK_RET_SUCCESS);
         return;
     }
-    set_fail(regs);
+    set_invalid(regs);
     // always send changed ??
     regs->ah = DISK_RET_ECHANGED;
 }
@@ -699,7 +710,7 @@ disk_134e(struct bregs *regs, struct drive_s *drive_g)
 static void
 disk_13XX(struct bregs *regs, struct drive_s *drive_g)
 {
-    disk_ret(regs, DISK_RET_EPARAM);
+    disk_ret_unimplemented(regs, DISK_RET_EPARAM);
 }
 
 static void
diff --git a/src/disk.h b/src/disk.h
index 832bf9b..7feb9af 100644
--- a/src/disk.h
+++ b/src/disk.h
@@ -101,6 +101,10 @@ struct bregs;
 void __disk_ret(struct bregs *regs, u32 linecode, const char *fname);
 #define disk_ret(regs, code) \
     __disk_ret((regs), (code) | (__LINE__ << 8), __func__)
+void __disk_ret_unimplemented(struct bregs *regs, u32 linecode
+                              , const char *fname);
+#define disk_ret_unimplemented(regs, code) \
+    __disk_ret_unimplemented((regs), (code) | (__LINE__ << 8), __func__)
 
 
 /****************************************************************
diff --git a/src/kbd.c b/src/kbd.c
index e5ffa33..39294a7 100644
--- a/src/kbd.c
+++ b/src/kbd.c
@@ -216,7 +216,7 @@ handle_16a2(struct bregs *regs)
 static void
 handle_16XX(struct bregs *regs)
 {
-    debug_stub(regs);
+    warn_unimplemented(regs);
 }
 
 static void
diff --git a/src/mouse.c b/src/mouse.c
index ca581a8..ac37cc0 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -46,7 +46,7 @@ mouse_15c20000(struct bregs *regs)
     u16 ebda_seg = get_ebda_seg();
     int ret = disable_mouse(ebda_seg);
     if (ret)
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
     else
         set_code_success(regs);
 }
@@ -58,7 +58,7 @@ mouse_15c20001(struct bregs *regs)
     u16 ebda_seg = get_ebda_seg();
     u8 mouse_flags_2 = GET_EBDA2(ebda_seg, mouse_flag2);
     if ((mouse_flags_2 & 0x80) == 0) {
-        set_code_fail(regs, RET_ENOHANDLER);
+        set_code_invalid(regs, RET_ENOHANDLER);
         return;
     }
 
@@ -69,7 +69,7 @@ mouse_15c20001(struct bregs *regs)
 
     int ret = aux_command(PSMOUSE_CMD_ENABLE, NULL);
     if (ret)
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
     else
         set_code_success(regs);
 }
@@ -77,7 +77,7 @@ mouse_15c20001(struct bregs *regs)
 static void
 mouse_15c200XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EINVFUNCTION);
+    set_code_unimplemented(regs, RET_EINVFUNCTION);
 }
 
 // Disable/Enable Mouse
@@ -98,7 +98,7 @@ mouse_15c201(struct bregs *regs)
     u8 param[2];
     int ret = aux_command(PSMOUSE_CMD_RESET_BAT, param);
     if (ret) {
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
         return;
     }
     regs->bl = param[0];
@@ -112,13 +112,13 @@ mouse_15c202(struct bregs *regs)
 {
     static u8 VAR16 sample_rates[7] = {10, 20, 40, 60, 80, 100, 200};
     if (regs->bh >= ARRAY_SIZE(sample_rates)) {
-        set_code_fail(regs, RET_EINVINPUT);
+        set_code_invalid(regs, RET_EINVINPUT);
         return;
     }
     u8 mouse_data1 = GET_GLOBAL(sample_rates[regs->bh]);
     int ret = aux_command(PSMOUSE_CMD_SETRATE, &mouse_data1);
     if (ret)
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
     else
         set_code_success(regs);
 }
@@ -133,13 +133,13 @@ mouse_15c203(struct bregs *regs)
     //      2 = 100 dpi, 4 counts per millimeter
     //      3 = 200 dpi, 8 counts per millimeter
     if (regs->bh >= 4) {
-        set_code_fail(regs, RET_EINVINPUT);
+        set_code_invalid(regs, RET_EINVINPUT);
         return;
     }
     u8 param = regs->bh;
     int ret = aux_command(PSMOUSE_CMD_SETRES, &param);
     if (ret)
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
     else
         set_code_success(regs);
 }
@@ -151,7 +151,7 @@ mouse_15c204(struct bregs *regs)
     u8 param[2];
     int ret = aux_command(PSMOUSE_CMD_GETID, param);
     if (ret) {
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
         return;
     }
     regs->bh = param[0];
@@ -163,7 +163,7 @@ static void
 mouse_15c205(struct bregs *regs)
 {
     if (regs->bh != 3) {
-        set_code_fail(regs, RET_EINTERFACE);
+        set_code_invalid(regs, RET_EINTERFACE);
         return;
     }
     u16 ebda_seg = get_ebda_seg();
@@ -181,7 +181,7 @@ mouse_15c20600(struct bregs *regs)
     u8 param[3];
     int ret = aux_command(PSMOUSE_CMD_GETINFO, param);
     if (ret) {
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
         return;
     }
     regs->bl = param[0];
@@ -196,7 +196,7 @@ mouse_15c20601(struct bregs *regs)
 {
     int ret = aux_command(PSMOUSE_CMD_SETSCALE11, NULL);
     if (ret)
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
     else
         set_code_success(regs);
 }
@@ -207,7 +207,7 @@ mouse_15c20602(struct bregs *regs)
 {
     int ret = aux_command(PSMOUSE_CMD_SETSCALE21, NULL);
     if (ret)
-        set_code_fail(regs, RET_ENEEDRESEND);
+        set_code_invalid(regs, RET_ENEEDRESEND);
     else
         set_code_success(regs);
 }
@@ -215,7 +215,7 @@ mouse_15c20602(struct bregs *regs)
 static void
 mouse_15c206XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EINVFUNCTION);
+    set_code_unimplemented(regs, RET_EINVFUNCTION);
 }
 
 // Return Status & Set Scaling Factor...
@@ -255,7 +255,7 @@ mouse_15c207(struct bregs *regs)
 static void
 mouse_15c2XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EINVFUNCTION);
+    set_code_unimplemented(regs, RET_EINVFUNCTION);
 }
 
 void
@@ -264,7 +264,7 @@ handle_15c2(struct bregs *regs)
     //debug_stub(regs);
 
     if (! CONFIG_MOUSE) {
-        set_code_fail(regs, RET_EUNSUPPORTED);
+        set_code_invalid(regs, RET_EUNSUPPORTED);
         return;
     }
 
diff --git a/src/output.c b/src/output.c
index 7e91bfe..e49010d 100644
--- a/src/output.c
+++ b/src/output.c
@@ -463,25 +463,61 @@ __debug_stub(struct bregs *regs, int lineno, const char *fname)
     dump_regs(regs);
 }
 
-// Report on a handler returning a failure notification to the caller.
+// Report on an invalid parameter.
 void
-__set_fail(struct bregs *regs, int lineno, const char *fname)
+__warn_invalid(struct bregs *regs, int lineno, const char *fname)
 {
-    dprintf(1, "fail %s:%d:\n", fname, lineno);
-    dump_regs(regs);
-    set_fail_silent(regs);
+    if (CONFIG_DEBUG_LEVEL >= DEBUG_invalid) {
+        dprintf(1, "invalid %s:%d:\n", fname, lineno);
+        dump_regs(regs);
+    }
+}
+
+// Report on an unimplemented feature.
+void
+__warn_unimplemented(struct bregs *regs, int lineno, const char *fname)
+{
+    if (CONFIG_DEBUG_LEVEL >= DEBUG_unimplemented) {
+        dprintf(1, "unimplemented %s:%d:\n", fname, lineno);
+        dump_regs(regs);
+    }
+}
+
+// Report a handler reporting an invalid parameter to the caller.
+void
+__set_invalid(struct bregs *regs, int lineno, const char *fname)
+{
+    __warn_invalid(regs, lineno, fname);
+    set_invalid_silent(regs);
 }
 
-// Report on a handler returning a failure code to the caller.  Note,
-// the lineno and return code are encoded in the same parameter as gcc
-// does a better job of scheduling function calls when there are 3 or
-// less parameters.
+// Report a call of an unimplemented function.
 void
-__set_code_fail(struct bregs *regs, u32 linecode, const char *fname)
+__set_unimplemented(struct bregs *regs, int lineno, const char *fname)
+{
+    __warn_unimplemented(regs, lineno, fname);
+    set_invalid_silent(regs);
+}
+
+// Report a handler reporting an invalid parameter code to the
+// caller.  Note, the lineno and return code are encoded in the same
+// parameter as gcc does a better job of scheduling function calls
+// when there are 3 or less parameters.
+void
+__set_code_invalid(struct bregs *regs, u32 linecode, const char *fname)
 {
     u8 code = linecode;
     u32 lineno = linecode >> 8;
-    dprintf(1, "fail %s:%d(%x):\n", fname, lineno, code);
-    dump_regs(regs);
-    set_code_fail_silent(regs, code);
+    __warn_invalid(regs, lineno, fname);
+    set_code_invalid_silent(regs, code);
+}
+
+// Report a call of an unimplemented function.
+void
+__set_code_unimplemented(struct bregs *regs, u32 linecode, const char *fname)
+{
+    u8 code = linecode;
+    u32 lineno = linecode >> 8;
+    __warn_unimplemented(regs, lineno, fname);
+    set_code_invalid_silent(regs, code);
 }
diff --git a/src/pcibios.c b/src/pcibios.c
index 5da079a..6fb7d9e 100644
--- a/src/pcibios.c
+++ b/src/pcibios.c
@@ -52,7 +52,7 @@ handle_1ab102(struct bregs *regs)
         set_code_success(regs);
         return;
     }
-    set_code_fail(regs, RET_DEVICE_NOT_FOUND);
+    set_code_invalid(regs, RET_DEVICE_NOT_FOUND);
 }
 
 // find class code
@@ -72,7 +72,7 @@ handle_1ab103(struct bregs *regs)
         set_code_success(regs);
         return;
     }
-    set_code_fail(regs, RET_DEVICE_NOT_FOUND);
+    set_code_invalid(regs, RET_DEVICE_NOT_FOUND);
 }
 
 // read configuration byte
@@ -129,7 +129,7 @@ handle_1ab10e(struct bregs *regs)
 {
     struct pir_header *pirtable_g = (void*)(GET_GLOBAL(PirOffset) + 0);
     if (! pirtable_g) {
-        set_code_fail(regs, RET_FUNC_NOT_SUPPORTED);
+        set_code_invalid(regs, RET_FUNC_NOT_SUPPORTED);
         return;
     }
 
@@ -144,7 +144,7 @@ handle_1ab10e(struct bregs *regs)
     u16 pirsize = GET_GLOBAL(pirtable_g->size) - sizeof(struct pir_header);
     SET_FARVAR(regs->es, param_far->size, pirsize);
     if (bufsize < pirsize) {
-        set_code_fail(regs, RET_BUFFER_TOO_SMALL);
+        set_code_invalid(regs, RET_BUFFER_TOO_SMALL);
         return;
     }
 
@@ -165,7 +165,7 @@ handle_1ab10e(struct bregs *regs)
 static void
 handle_1ab1XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_FUNC_NOT_SUPPORTED);
+    set_code_unimplemented(regs, RET_FUNC_NOT_SUPPORTED);
 }
 
 void
@@ -174,7 +174,7 @@ handle_1ab1(struct bregs *regs)
     //debug_stub(regs);
 
     if (! CONFIG_PCIBIOS) {
-        set_fail(regs);
+        set_invalid(regs);
         return;
     }
 
diff --git a/src/serial.c b/src/serial.c
index 19e39ca..493d421 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -79,12 +79,12 @@ static u16
 getComAddr(struct bregs *regs)
 {
     if (regs->dx >= 4) {
-        set_fail(regs);
+        set_invalid(regs);
         return 0;
     }
     u16 addr = GET_BDA(port_com[regs->dx]);
     if (! addr)
-        set_fail(regs);
+        set_invalid(regs);
     return addr;
 }
 
@@ -178,8 +178,7 @@ handle_1403(struct bregs *regs)
 static void
 handle_14XX(struct bregs *regs)
 {
-    // Unsupported
-    set_fail(regs);
+    set_unimplemented(regs);
 }
 
 // INT 14h Serial Communications Service Entry Point
@@ -245,12 +244,12 @@ static u16
 getLptAddr(struct bregs *regs)
 {
     if (regs->dx >= 3) {
-        set_fail(regs);
+        set_invalid(regs);
         return 0;
     }
     u16 addr = GET_BDA(port_lpt[regs->dx]);
     if (! addr)
-        set_fail(regs);
+        set_invalid(regs);
     return addr;
 }
 
@@ -319,8 +318,7 @@ handle_1702(struct bregs *regs)
 static void
 handle_17XX(struct bregs *regs)
 {
-    // Unsupported
-    set_fail(regs);
+    set_unimplemented(regs);
 }
 
 // INT17h : Printer Service Entry Point
diff --git a/src/system.c b/src/system.c
index e8ed5a7..ffcced9 100644
--- a/src/system.c
+++ b/src/system.c
@@ -58,7 +58,7 @@ handle_152403(struct bregs *regs)
 static void
 handle_1524XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EUNSUPPORTED);
+    set_code_unimplemented(regs, RET_EUNSUPPORTED);
 }
 
 static void
@@ -198,7 +198,7 @@ handle_1591(struct bregs *regs)
 static void
 handle_154f(struct bregs *regs)
 {
-    set_fail_silent(regs);
+    set_invalid_silent(regs);
 }
 
 static void
@@ -256,7 +256,7 @@ handle_15e820(struct bregs *regs)
     int count = GET_GLOBAL(e820_count);
     if (regs->edx != 0x534D4150 || regs->bx >= count
         || regs->ecx < sizeof(e820_list[0])) {
-        set_code_fail(regs, RET_EUNSUPPORTED);
+        set_code_invalid(regs, RET_EUNSUPPORTED);
         return;
     }
 
@@ -275,7 +275,7 @@ handle_15e820(struct bregs *regs)
 static void
 handle_15e8XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EUNSUPPORTED);
+    set_code_unimplemented(regs, RET_EUNSUPPORTED);
 }
 
 static void
@@ -291,7 +291,7 @@ handle_15e8(struct bregs *regs)
 static void
 handle_15XX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EUNSUPPORTED);
+    set_code_unimplemented(regs, RET_EUNSUPPORTED);
 }
 
 // INT 15h System Services Entry Point
diff --git a/src/vgahooks.c b/src/vgahooks.c
index 701e83c..ef33be5 100644
--- a/src/vgahooks.c
+++ b/src/vgahooks.c
@@ -4,7 +4,7 @@
 //
 // This file may be distributed under the terms of the GNU LGPLv3 license.
 
-#include "bregs.h" // set_code_fail
+#include "bregs.h" // set_code_invalid
 #include "biosvar.h" // GET_GLOBAL
 #include "pci.h" // pci_find_device
 #include "pci_regs.h" // PCI_VENDOR_ID
@@ -20,7 +20,7 @@ int CBmainboard VAR16VISIBLE;
 static void
 handle_155fXX(struct bregs *regs)
 {
-    set_code_fail(regs, RET_EUNSUPPORTED);
+    set_code_unimplemented(regs, RET_EUNSUPPORTED);
 }
 
 
@@ -127,7 +127,7 @@ via_155f18(struct bregs *regs)
 
 done:
     if (fbsize < 0 || ramspeed < 0) {
-        set_code_fail(regs, RET_EUNSUPPORTED);
+        set_code_invalid(regs, RET_EUNSUPPORTED);
         return;
     }
     regs->eax = 0x5f;
@@ -139,7 +139,7 @@ done:
 static void
 via_155f19(struct bregs *regs)
 {
-    set_fail_silent(regs);
+    set_invalid_silent(regs);
 }
 
 static void