775a02cf3f
Bring up minos on the Allwinner D1 (Lichee RV) over FEL/xfel and add bidirectional UART so the console can read keystrokes, not just print. D1 / Lichee RV boot: - riscv arch.c: select UART0 base by -DBOARD_D1 (0x02500000 vs QEMU 0x10000000) and add a reg-shift abstraction (uart_rd/uart_wr): the D1's Synopsys DW-8250 uses 32-bit registers at 4-byte spacing, which is what made the first hardware boot silent. - d1_uart0_init(): gate/deassert UART0 clock, mux PB8/PB9 to UART0, set 115200 8N1, clear FIFOs, force non-loopback, drain stale RX. - link-d1.ld: link for DRAM at 0x40000000 (xfel exec target, M-mode). - Makefile: 'lichee' builds the flat binary; 'run-lichee' loads it via xfel (ddr d1 / write / exec). - arch_name() reports the concrete board. UART input (all archs): - arch contract gains arch_uart_getc() and arch_uart_rx_ready(), implemented for riscv, x86 (COM1) and arm (Cadence UART). - console gains getc() and drain_rx(). - kmain() runs an interactive echo loop (seed of the M3 console). Verified: echo works under QEMU on x86/riscv/arm, and on real D1 hardware (banner once, then live keystroke echo over UART0 @115200).
41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
/* arch.h — the per-arch contract.
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*
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* The common C core is arch-agnostic: it only calls these functions.
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* Each arch/<name>/ provides an implementation. This is the whole
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* "boundary" between the minimal asm/glue and the portable C.
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*/
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#ifndef MINOS_ARCH_H
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#define MINOS_ARCH_H
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/* Early, arch-specific bring-up done before kmain() prints anything:
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* e.g. point UART at the right MMIO/port. Called from the asm entry's
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* C landing pad, or the very top of kmain(). */
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void arch_early_init(void);
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/* Emit one byte to the platform's debug UART. The console layer in
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* common/console.c builds print()/puts() on top of just this. */
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void arch_uart_putc(char c);
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/* Blocking read of one byte from the debug UART (polls the RX FIFO).
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* The UART is full-duplex, so this is the mirror of arch_uart_putc. */
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char arch_uart_getc(void);
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/* Non-blocking: return 1 if a received byte is waiting, else 0. Lets the
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* console drain any stale/echoed RX bytes without blocking. */
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int arch_uart_rx_ready(void);
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/* Install the interrupt/trap vector table (IDT / mtvec / VBAR).
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* M1 stubs this; M2 makes it handle a timer tick. */
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void arch_set_trap_vector(void);
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/* Name of the architecture, for the banner. */
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const char *arch_name(void);
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/* Human-readable current CPU privilege mode (e.g. "ring0", "M-mode",
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* "SVC"). Reads the live hardware state so the banner proves it. */
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const char *arch_cpu_mode(void);
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/* Halt the CPU (wfi / hlt) — end of kmain(). */
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void arch_halt(void) __attribute__((noreturn));
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#endif /* MINOS_ARCH_H */
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