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kaf24@localhost.localdomain
dd59dfdfb1
compiled with gcc and linked into the hvmloader as a byte-array. Hvmloader allocates memory (rounded up to next 64kb) from the e820 table below 4GB, copies and relocates the 32bit code in the allocated area and copies a jumptable (located in a section '.biosjumptable') pointing to the 'exported' functions into the Bochs BIOS's memory area to link the two code sections. The memory area has been reserved and can be identified with the signature '___JMPT'. In the Bochs BIOS only stub functions are provided. These load the index of a particular function in the jump table, switch to protected mode and call the function in the high memory area. The stack is prepared such that functions compiled by gcc can just pick the parameters from the stack as usual - this means that the 16bit real-mode return address is taken off the stack. The stub functions should have the same signature as those in 32bit space. For ABI compatibility reasons parameters inside the Bochs BIOS stubs should all be 32bit wide. This patch includes a test function that calls three gcc-compiled functions in the high memory area and displays their success status. Simple tests are done doing multiplication and addition of 32-bit numbers and reading and modification of a static variable. These functions test the interface and the relocation code. The test code is removed in patch part 3. Signed-off-by: Stefan Berger <stefanb@us.ibm.com>
88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
#ifndef __HVMLOADER_UTIL_H__
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#define __HVMLOADER_UTIL_H__
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#include <stdarg.h>
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#undef offsetof
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#define offsetof(t, m) ((unsigned long)&((t *)0)->m)
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#undef NULL
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#define NULL ((void*)0)
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extern void __assert_failed(char *assertion, char *file, int line)
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__attribute__((noreturn));
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#define ASSERT(p) \
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do { if (!(p)) __assert_failed(#p, __FILE__, __LINE__); } while (0)
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extern void __bug(char *file, int line) __attribute__((noreturn));
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#define BUG() __bug()
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/* I/O output */
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void outb(uint16_t addr, uint8_t val);
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void outw(uint16_t addr, uint16_t val);
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void outl(uint16_t addr, uint32_t val);
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/* I/O input */
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uint8_t inb(uint16_t addr);
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uint16_t inw(uint16_t addr);
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uint32_t inl(uint16_t addr);
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/* APIC access */
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uint32_t ioapic_read(uint32_t reg);
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void ioapic_write(uint32_t reg, uint32_t val);
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uint32_t lapic_read(uint32_t reg);
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void lapic_write(uint32_t reg, uint32_t val);
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/* PCI access */
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uint32_t pci_read(uint32_t devfn, uint32_t reg, uint32_t len);
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#define pci_readb(devfn, reg) ((uint8_t) pci_read(devfn, reg, 1))
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#define pci_readw(devfn, reg) ((uint16_t)pci_read(devfn, reg, 2))
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#define pci_readl(devfn, reg) ((uint32_t)pci_read(devfn, reg, 4))
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void pci_write(uint32_t devfn, uint32_t reg, uint32_t len, uint32_t val);
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#define pci_writeb(devfn, reg, val) (pci_write(devfn, reg, 1, (uint8_t) val))
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#define pci_writew(devfn, reg, val) (pci_write(devfn, reg, 2, (uint16_t)val))
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#define pci_writel(devfn, reg, val) (pci_write(devfn, reg, 4, (uint32_t)val))
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/* Do cpuid instruction, with operation 'idx' */
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void cpuid(uint32_t idx, uint32_t *eax, uint32_t *ebx,
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uint32_t *ecx, uint32_t *edx);
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/* HVM-builder info. */
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int get_vcpu_nr(void);
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int get_acpi_enabled(void);
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int get_apic_mode(void);
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/* String and memory functions */
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int strcmp(const char *cs, const char *ct);
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int strncmp(const char *s1, const char *s2, uint32_t n);
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char *strcpy(char *dest, const char *src);
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char *strncpy(char *dest, const char *src, unsigned n);
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unsigned strlen(const char *s);
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int memcmp(const void *s1, const void *s2, unsigned n);
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void *memcpy(void *dest, const void *src, unsigned n);
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void *memmove(void *dest, const void *src, unsigned n);
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void *memset(void *s, int c, unsigned n);
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char *itoa(char *a, unsigned int i);
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/* convert a byte to two lowercase hex digits, with no terminating NUL
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character. digits[] must have at least two elements. */
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void byte_to_hex(char *digits, uint8_t byte);
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/* Convert an array of 16 unsigned bytes to a DCE/OSF formatted UUID
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string. Pre-condition: sizeof(dest) >= 37 */
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void uuid_to_string(char *dest, uint8_t *uuid);
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/* Debug output */
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int printf(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
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int vprintf(const char *fmt, va_list ap);
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/* Allocate region of specified type in the e820 table. */
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uint64_t e820_malloc(uint64_t size, uint32_t type, uint64_t mask);
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/* Prepare the 32bit BIOS */
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int highbios_setup(void);
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#define isdigit(c) ((c) >= '0' && (c) <= '9')
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#endif /* __HVMLOADER_UTIL_H__ */
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