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PoC: Remove low privilege syscall

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Mikael Ågren 2024-12-16 13:00:54 +01:00
parent ecdbb25013
commit 7f34f5db91
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GPG key ID: E02DA3D397792C46
4 changed files with 16 additions and 63 deletions
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26
hw/application_fpga/rtl/application_fpga.v
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@ -54,14 +54,12 @@ module application_fpga (
localparam UART_PREFIX = 6'h03;
localparam TOUCH_SENSE_PREFIX = 6'h04;
localparam FW_RAM_PREFIX = 6'h10;
localparam IRQ30_PREFIX = 6'h20;
localparam IRQ31_PREFIX = 6'h21;
localparam TK1_PREFIX = 6'h3f;
// Instruction used to cause a trap.
localparam ILLEGAL_INSTRUCTION = 32'h0;
localparam IRQ30_IRQ_MASK = 2 ** 30;
localparam IRQ31_IRQ_MASK = 2 ** 31;
//----------------------------------------------------------------
@ -143,10 +141,6 @@ module application_fpga (
wire [31 : 0] touch_sense_read_data;
wire touch_sense_ready;
reg irq30_cs;
reg irq30_we;
reg irq30_eoi;
reg irq31_cs;
reg irq31_we;
reg irq31_eoi;
@ -187,8 +181,8 @@ module application_fpga (
.ENABLE_IRQ (1),
.ENABLE_IRQ_QREGS(0),
.ENABLE_IRQ_TIMER(0),
.MASKED_IRQ (~(IRQ31_IRQ_MASK | IRQ30_IRQ_MASK)),
.LATCHED_IRQ (IRQ31_IRQ_MASK | IRQ30_IRQ_MASK)
.MASKED_IRQ (~IRQ31_IRQ_MASK),
.LATCHED_IRQ (IRQ31_IRQ_MASK)
) cpu (
.clk(clk),
.resetn(reset_n),
@ -368,8 +362,7 @@ module application_fpga (
.gpio3(app_gpio3),
.gpio4(app_gpio4),
.access_level_hi (irq31_eoi),
.access_level_med(irq30_eoi),
.access_level_hi(irq31_eoi),
.fw_ram_en(fw_ram_en),
@ -405,14 +398,11 @@ module application_fpga (
//----------------------------------------------------------------
always @* begin : irq_ctrl
reg irq31_set;
reg irq30_set;
irq31_set = irq31_cs & irq31_we;
irq30_set = irq30_cs & irq30_we;
cpu_irq = {irq31_set, irq30_set, 30'h0};
cpu_irq = {irq31_set, 31'h0};
irq31_eoi = cpu_eoi[31];
irq30_eoi = cpu_eoi[30];
end
@ -465,9 +455,6 @@ module application_fpga (
touch_sense_we = |cpu_wstrb;
touch_sense_address = cpu_addr[9 : 2];
irq30_cs = 1'h0;
irq30_we = |cpu_wstrb;
irq31_cs = 1'h0;
irq31_we = |cpu_wstrb;
@ -543,11 +530,6 @@ module application_fpga (
muxed_ready_new = fw_ram_ready;
end
IRQ30_PREFIX: begin
irq30_cs = 1'h1;
muxed_ready_new = 1'h1;
end
IRQ31_PREFIX: begin
irq31_cs = 1'h1;
muxed_ready_new = 1'h1;