Initial import

ape/config.h

@@ -0,0 +1,137 @@
+#ifndef APE_CONFIG_H_
+#define APE_CONFIG_H_
+#include "ape/relocations.h"
+#include "libc/macros.h"
+
+/**
+ * @fileverview αcτµαlly pδrταblε εxεcµταblε configuration.
+ */
+
+/**
+ * Post-Initialization Read-Only Code Size Threshold.
+ *
+ * An executable needs to have at least this much code, before the
+ * linker adds non-mandatory 4kb alignments. The benefit is better
+ * memory protection. The tradeoff is sparser binaries.
+ */
+#ifndef APE_PIRO_THRESHOLD
+#ifdef CONFIG_DBG
+#define APE_PIRO_THRESHOLD 0x1000
+#else
+#define APE_PIRO_THRESHOLD 0x10000
+#endif
+#endif
+
+/**
+ * PC Standard I/O Configuration.
+ */
+#ifndef METAL_STDIN
+#define METAL_STDIN COM1
+#endif
+#ifndef METAL_STDOUT
+#define METAL_STDOUT COM1
+#endif
+#ifndef METAL_STDERR
+#define METAL_STDERR COM2 /* will fallback to stdout if COM2 not present */
+#endif
+
+/**
+ * PC Display Configuration (MDA/CGA)
+ * @see www.lammertbies.nl/comm/info/serial-uart.html
+ * @see ape/lib/vidya.h
+ */
+#ifndef VIDYA_MODE
+#define VIDYA_MODE VIDYA_MODE_MDA
+#endif
+
+/* FPU Control Word (x87) Exception Masks
+   @see Intel Manual V1 §8.1.5
+
+       IM: Invalid Operation ───────────────┐
+       DM: Denormal Operand ───────────────┐│
+       ZM: Zero Divide ───────────────────┐││
+       OM: Overflow ─────────────────────┐│││
+       UM: Underflow ───────────────────┐││││
+       PM: Precision ──────────────────┐│││││
+      PC: Precision Control ────────┐  ││││││
+       {float,∅,double,long double} │  ││││││
+      RC: Rounding Control ───────┐ │  ││││││
+       {even, →-∞, →+∞, →0}       │┌┤  ││││││
+                                 ┌┤││  ││││││
+                                d││││rr││││││*/
+#define X87_NORMAL    0b000000000001101111111
+#define X87_DTOA      0b000000000001000000000
+#define X87_DTOA_MASK 0b000000000001100000000
+#ifndef X87_DEFAULT
+#define X87_DEFAULT X87_NORMAL
+#endif
+
+/**
+ * Serial Line Configuration (8250 UART 16550)
+ * @see ape/lib/uart.h
+ */
+#ifndef UART_BAUD_RATE
+#define UART_BAUD_RATE 9600 /* bits per second ∈ [50,115200] */
+#endif
+#define UART_CONF_DLR (1843200 /*hz*/ / 16 /*wut*/ / (UART_BAUD_RATE))
+#ifndef UART_CONF_IIR
+/*                      ┌interrupt trigger level {1,4,8,14}
+                        │ ┌enable 64 byte fifo (UART 16750+)
+                        │ │ ┌select dma mode
+                        │ │ │┌clear transmit fifo
+                        │ │ ││┌clear receive fifo
+                        ├┐│ │││┌enable fifos*/
+#define UART_CONF_IIR 0b00000000
+#endif
+#ifndef UART_CONF_LCR
+/*                      ┌dlab: flips configuration mode state
+                        │┌enable break signal
+                        ││ ┌parity {none,odd,even,high,low}
+                        ││ │ ┌extra stop bit
+                        ││ │ │┌data word length (bits+5)
+                        ││┌┴┐│├┐*/
+#define UART_CONF_LCR 0b01000011
+#endif
+
+/**
+ * eXtreme Low Memory.
+ */
+#define XLM(VAR)                            (XLM_BASE_REAL + XLM_##VAR)
+#define XLMV(VAR)                           (__xlm + XLM_##VAR)
+#define XLM_BASE_REAL                       0x1000
+#define XLM_E820                            0
+#define XLM_E820_SIZE                       0x2000
+#define XLM_BIOS_DATA_AREA                  0x2000
+#define XLM_BIOS_DATA_AREA_SIZE             256
+#define XLM_DRIVE_BASE_TABLE                0x2200 /* drive values are contiguous */
+#define XLM_DRIVE_BASE_TABLE_SIZE           11
+#define XLM_DRIVE_TYPE                      0x220b
+#define XLM_DRIVE_TYPE_SIZE                 1
+#define XLM_DRIVE_LAST_SECTOR               0x220c /* 1-based inclusive, e.g. 18 */
+#define XLM_DRIVE_LAST_SECTOR_SIZE          1
+#define XLM_DRIVE_LAST_CYLINDER             0x220d /* 0-based incl, e.g. 79 */
+#define XLM_DRIVE_LAST_CYLINDER_SIZE        2
+#define XLM_DRIVE_ATTACHED                  0x220f
+#define XLM_DRIVE_ATTACHED_SIZE             1
+#define XLM_DRIVE_LAST_HEAD                 0x2210 /* 0-based inclusive, e.g. 1 */
+#define XLM_DRIVE_LAST_HEAD_SIZE            1
+#define XLM_DRIVE                           0x2211
+#define XLM_DRIVE_SIZE                      1
+#define XLM_HAVEEXTMEMKB                    0x2212
+#define XLM_HAVEEXTMEMKB_SIZE               4
+#define XLM_VIDEO_POSITION_FAR_POINTER      0x2216 /* video cursor far pointer */
+#define XLM_VIDEO_POSITION_FAR_POINTER_SIZE 4
+#define XLM_PAGE_TABLE_STACK_POINTER        0x2220
+#define XLM_PAGE_TABLE_STACK_POINTER_SIZE   8
+#define XLM_BADIDT                          0x2230
+#define XLM_BADIDT_SIZE                     6
+#define XLM_LOADSTATE                       0x2240
+#define XLM_LOADSTATE_SIZE                  4
+#define XLM_SIZE                            ROUNDUP(XLM_LOADSTATE + XLM_LOADSTATE_SIZE, 0x1000)
+#define IMAGE_BASE_REAL                     (XLM_BASE_REAL + XLM_SIZE)
+
+#if !defined(__LINKER__) && !defined(__ASSEMBLER__)
+extern char __xlm[XLM_SIZE];
+#endif /* !defined(__LINKER__) && !defined(__ASSEMBLER__) */
+
+#endif /* APE_CONFIG_H_ */