52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
#include <kernel/drivers/vbr.h>
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#include <kernel/bits/driver.h>
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#include <string.h>
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// Internal globals for abstractions
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void (*int_handler[VBR_INTERRUPT_NB])(void);
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int vbr_driver_is_installed = 0;
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void *old_vbr;
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// TODO: save area before dump ?
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static void vbr_driver_install(void)
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{
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extern uint32_t vhex_vbr;
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extern uint32_t bvhex_ram;
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extern uint32_t bvhex_rom;
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extern uint32_t svhex;
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// Save and switch the VBR
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// @note: The VBR swtich *SHOULD* be atomic because
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// one exepction / interrupt will crash the calculator.
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old_vbr = vbr_set(&vhex_vbr);
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// Check if the VBR driver is already installed
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if (vbr_driver_is_installed != 0)
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return;
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// Dump VBR handlers (interrupt and exception)
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memcpy(&bvhex_ram, &bvhex_rom, (size_t)&svhex);
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// Initialize pseudo-abtraction
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// TODO: Find better way to do the job
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for (int i = 0 ; i < VBR_INTERRUPT_NB ; ++i)
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int_handler[i] = NULL;
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// Indicate that the driver is installed
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vbr_driver_is_installed = 1;
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}
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static void vbr_driver_uninstall(void)
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{
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// restore old VBR
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vbr_set(old_vbr);
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}
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// Create driver object
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VHEX_DRIVER(3, driver_vbr) = {
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.arch = MPU_SH7305,
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.install = &vbr_driver_install,
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.uninstall = &vbr_driver_uninstall,
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.name = "vbr"
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};
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