59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
/*====================================================================
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filename: gdsp_registers.cpp
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project: GCemu
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created: 2004-6-18
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mail: duddie@walla.com
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Copyright (c) 2005 Duddie & Tratax
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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====================================================================*/
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#include "Common/Common.h"
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#include "Core/DSP/DSPCore.h"
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#include "Core/DSP/DSPStacks.h"
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// Stacks. The stacks are outside the DSP RAM, in dedicated hardware.
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static void dsp_reg_stack_push(int stack_reg)
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{
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g_dsp.reg_stack_ptr[stack_reg]++;
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g_dsp.reg_stack_ptr[stack_reg] &= DSP_STACK_MASK;
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g_dsp.reg_stack[stack_reg][g_dsp.reg_stack_ptr[stack_reg]] = g_dsp.r.st[stack_reg];
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}
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static void dsp_reg_stack_pop(int stack_reg)
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{
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g_dsp.r.st[stack_reg] = g_dsp.reg_stack[stack_reg][g_dsp.reg_stack_ptr[stack_reg]];
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g_dsp.reg_stack_ptr[stack_reg]--;
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g_dsp.reg_stack_ptr[stack_reg] &= DSP_STACK_MASK;
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}
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void dsp_reg_store_stack(int stack_reg, u16 val)
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{
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dsp_reg_stack_push(stack_reg);
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g_dsp.r.st[stack_reg] = val;
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}
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u16 dsp_reg_load_stack(int stack_reg)
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{
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u16 val = g_dsp.r.st[stack_reg];
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dsp_reg_stack_pop(stack_reg);
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return val;
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}
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