diff options
Diffstat (limited to 'xen/arch/arm/arm64/head.S')
| -rw-r--r-- | xen/arch/arm/arm64/head.S | 69 |
1 files changed, 31 insertions, 38 deletions
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index ef0289996b..79a8da9f37 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -29,9 +29,13 @@ #define PT_DEV 0xe71 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=0 P=1 */ #define PT_DEV_L3 0xe73 /* nG=1 AF=1 SH=10 AP=01 NS=1 ATTR=100 T=1 P=1 */ +#if (defined (EARLY_PRINTK)) && (defined (EARLY_PRINTK_INC)) +#include EARLY_PRINTK_INC +#endif + /* Macro to print a string to the UART, if there is one. - * Clobbers r0-r3. */ -#ifdef EARLY_UART_ADDRESS + * Clobbers x0-x3. */ +#ifdef EARLY_PRINTK #define PRINT(_s) \ adr x0, 98f ; \ bl puts ; \ @@ -39,9 +43,9 @@ 98: .asciz _s ; \ .align 2 ; \ 99: -#else +#else /* EARLY_PRINTK */ #define PRINT(s) -#endif +#endif /* !EARLY_PRINTK */ /*.aarch64*/ @@ -109,8 +113,8 @@ real_start: 2: boot_cpu: -#ifdef EARLY_UART_ADDRESS - ldr x23, =EARLY_UART_ADDRESS /* x23 := UART base address */ +#ifdef EARLY_PRINTK + ldr x23, =EARLY_UART_BASE_ADDRESS /* x23 := UART base address */ cbnz x22, 1f bl init_uart /* CPU 0 sets up the UART too */ 1: PRINT("- CPU ") @@ -206,7 +210,6 @@ skip_bss: mov x4, x1 /* Next level into xen_first */ /* console fixmap */ -#ifdef EARLY_UART_ADDRESS ldr x1, =xen_fixmap add x1, x1, x20 /* x1 := paddr (xen_fixmap) */ lsr x2, x23, #12 @@ -214,7 +217,6 @@ skip_bss: mov x3, #PT_DEV_L3 orr x2, x2, x3 /* x2 := 4K dev map including UART */ str x2, [x1, #(FIXMAP_CONSOLE*8)] /* Map it in the first fixmap's slot */ -#endif /* Build the baseline idle pagetable's first-level entries */ ldr x1, =xen_second @@ -266,10 +268,8 @@ pt_ready: br x1 /* Get a proper vaddr into PC */ paging: -#ifdef EARLY_UART_ADDRESS /* Use a virtual address to access the UART. */ ldr x23, =FIXMAP_ADDR(FIXMAP_CONSOLE) -#endif PRINT("- Ready -\r\n") @@ -329,51 +329,44 @@ fail: PRINT("- Boot failed -\r\n") 1: wfe b 1b -#ifdef EARLY_UART_ADDRESS +#ifdef EARLY_PRINTK -/* Bring up the UART. Specific to the PL011 UART. - * Clobbers r0-r2 */ +/* Bring up the UART. + * x23: Early UART base address + * Clobbers x0-x1 */ init_uart: - mov x1, #0x0 - strh w1, [x23, #0x24] /* -> UARTIBRD (Baud divisor fraction) */ - mov x1, #0x4 /* 7.3728MHz / 0x4 == 16 * 115200 */ - strh w1, [x23, #0x24] /* -> UARTIBRD (Baud divisor integer) */ - mov x1, #0x60 /* 8n1 */ - strh w1, [x23, #0x24] /* -> UARTLCR_H (Line control) */ - ldr x1, =0x00000301 /* RXE | TXE | UARTEN */ - strh w1, [x23, #0x30] /* -> UARTCR (Control Register) */ + early_uart_init x23, 0 adr x0, 1f b puts 1: .asciz "- UART enabled -\r\n" .align 4 -/* Print early debug messages. Specific to the PL011 UART. - * r0: Nul-terminated string to print. - * Clobbers r0-r2 */ +/* Print early debug messages. + * x0: Nul-terminated string to print. + * x23: Early UART base address + * Clobbers x0-x1 */ puts: - ldrh w2, [x23, #0x18] /* <- UARTFR (Flag register) */ - tst w2, #0x8 /* Check BUSY bit */ - b.ne puts /* Wait for the UART to be ready */ - ldrb w2, [x0], #1 /* Load next char */ - cbz w2, 1f /* Exit on nul */ - str w2, [x23] /* -> UARTDR (Data Register) */ + early_uart_ready x23, 1 + ldrb w1, [x0], #1 /* Load next char */ + cbz w1, 1f /* Exit on nul */ + early_uart_transmit x23, w1 b puts 1: ret /* Print a 32-bit number in hex. Specific to the PL011 UART. - * r0: Number to print. - * clobbers r0-r3 */ + * x0: Number to print. + * x23: Early UART base address + * Clobbers x0-x3 */ putn: adr x1, hex mov x3, #8 -1: ldrh w2, [x23, #0x18] /* <- UARTFR (Flag register) */ - tst w2, #0x8 /* Check BUSY bit */ - b.ne 1b /* Wait for the UART to be ready */ +1: + early_uart_ready x23, 2 and x2, x0, #0xf0000000 /* Mask off the top nybble */ lsr x2, x2, #28 ldrb w2, [x1, x2] /* Convert to a char */ - strb w2, [x23] /* -> UARTDR (Data Register) */ + early_uart_transmit x23, w2 lsl x0, x0, #4 /* Roll it through one nybble at a time */ subs x3, x3, #1 b.ne 1b @@ -382,7 +375,7 @@ putn: hex: .ascii "0123456789abcdef" .align 2 -#else /* EARLY_UART_ADDRESS */ +#else /* EARLY_PRINTK */ init_uart: .global early_puts @@ -390,4 +383,4 @@ early_puts: puts: putn: ret -#endif /* EARLY_UART_ADDRESS */ +#endif /* EARLY_PRINTK */ |